Map instance records carry their own length

They are not a fixed 76 bytes. The first int of each record is its length,
and while most placements are 76, every track also has eight of 140, two
of 80 and one of 336 - 560 on Paingod's. Striding a fixed 76 landed
mid-record on those, and hunting forward for the next plausible
quaternion then locked onto arbitrary bytes: that is where the impossible
class ids came from, and the "resource id" 1065353216, which is
0x3F800000 - float 1.0.

Reading the length instead, all eighteen tracks parse to exactly their
declared instance count with no bytes left over. That is the check that
was missing before.

It does not change what gets drawn, because the extra records were never
drawable anyway. It does mean the parse is no longer guessing.

docs/tracks.html

@@ -312,7 +312,7 @@ h1 em { font-style: normal; color: var(--sys); }
       <div><dt>Extent</dt><dd>231 &times; 5708</dd></div>
       <div><dt>Relief</dt><dd>90</dd></div>
     </dl>
-    <p class="twin">Same footprint and instance count as -- Wiserguy's --</p><p class="twin">118 of 133 placements are drawn; the rest carry no map art or stand alone off the course</p>
+    <p class="twin">118 of 133 placements are drawn; the rest carry no map art or stand alone off the course</p>
   </div>
 </article>
 <article class="trk" data-tags="arcade race football" data-search="burnt burnt cookies">
@@ -406,9 +406,9 @@ h1 em { font-style: normal; color: var(--sys); }
       <div><dt>Cameras</dt><dd>20</dd></div>
       <div><dt>Start boxes</dt><dd>20</dd></div>
       <div><dt>Extent</dt><dd>1187 &times; 23298</dd></div>
-      <div><dt>Relief</dt><dd>415</dd></div>
+      <div><dt>Relief</dt><dd>627</dd></div>
     </dl>
-    <p class="twin">594 of 607 placements are drawn; the rest carry no map art or stand alone off the course</p>
+    <p class="twin">595 of 607 placements are drawn; the rest carry no map art or stand alone off the course</p>
   </div>
 </article>
 <article class="trk" data-tags="later race" data-search="donut -- donut --">
@@ -428,7 +428,7 @@ h1 em { font-style: normal; color: var(--sys); }
   </div>
 </article>
 <article class="trk" data-tags="later race" data-search="trough -- ares&#x27; armpits --">
-  <figure class="plan"><span class="plan__img" role="img" aria-label="-- Ares&#x27; Armpits -- plan view" style="--art:url(data:image/png;base64,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);--ar:41/520"></span><figcaption class="plan__src">Course traced from the gates</figcaption></figure>
+  <figure class="plan"><span class="plan__img" role="img" aria-label="-- Ares&#x27; Armpits -- plan view" style="--art:url(data:image/png;base64,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);--ar:41/520"></span><figcaption class="plan__src">Course traced from the gates</figcaption></figure>
   <div class="trk__body">
     <h3>-- Ares&#x27; Armpits --</h3>
     <p class="trk__key">trough</p>
@@ -440,7 +440,7 @@ h1 em { font-style: normal; color: var(--sys); }
       <div><dt>Extent</dt><dd>322 &times; 9217</dd></div>
       <div><dt>Relief</dt><dd>530</dd></div>
     </dl>
-    <p class="twin">580 of 633 placements are drawn; the rest carry no map art or stand alone off the course</p>
+    <p class="twin">619 of 633 placements are drawn; the rest carry no map art or stand alone off the course</p>
   </div>
 </article>
 <article class="trk" data-tags="later race" data-search="rpweekend2014 -- zaxxis --">
@@ -456,11 +456,11 @@ h1 em { font-style: normal; color: var(--sys); }
       <div><dt>Extent</dt><dd>3389 &times; 5959</dd></div>
       <div><dt>Relief</dt><dd>266</dd></div>
     </dl>
-    <p class="twin">678 of 695 placements are drawn; the rest carry no map art or stand alone off the course</p>
+    <p class="twin">683 of 695 placements are drawn; the rest carry no map art or stand alone off the course</p>
   </div>
 </article>
 <article class="trk" data-tags="later race" data-search="wiserguys -- wiserguy&#x27;s --">
-  <figure class="plan"><span class="plan__img" role="img" aria-label="-- Wiserguy&#x27;s -- plan view" style="--art:url(data:image/png;base64,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);--ar:32/520"></span><figcaption class="plan__src">Course traced from the gates</figcaption></figure>
+  <figure class="plan"><span class="plan__img" role="img" aria-label="-- Wiserguy&#x27;s -- plan view" style="--art:url(data:image/png;base64,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);--ar:32/520"></span><figcaption class="plan__src">Course traced from the gates</figcaption></figure>
   <div class="trk__body">
     <h3>-- Wiserguy&#x27;s --</h3>
     <p class="trk__key">wiserguys</p>
@@ -469,14 +469,14 @@ h1 em { font-style: normal; color: var(--sys); }
       <div><dt>Instances</dt><dd>133</dd></div>
       <div><dt>Cameras</dt><dd>16</dd></div>
       <div><dt>Start boxes</dt><dd>9</dd></div>
-      <div><dt>Extent</dt><dd>231 &times; 5708</dd></div>
-      <div><dt>Relief</dt><dd>138</dd></div>
+      <div><dt>Extent</dt><dd>1513 &times; 5708</dd></div>
+      <div><dt>Relief</dt><dd>150</dd></div>
     </dl>
-    <p class="twin">Same footprint and instance count as Wiseguy's Wake</p><p class="twin">117 of 133 placements are drawn; the rest carry no map art or stand alone off the course</p>
+    <p class="twin">118 of 133 placements are drawn; the rest carry no map art or stand alone off the course</p>
   </div>
 </article>
 <article class="trk" data-tags="later race" data-search="demoderb -- arena (large) --">
-  <figure class="plan"><span class="plan__img" role="img" aria-label="-- Arena (Large) -- plan view" style="--art:url(data:image/png;base64,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);--ar:520/518"></span><figcaption class="plan__src">Wall blocks &mdash; no single course to trace</figcaption></figure>
+  <figure class="plan"><span class="plan__img" role="img" aria-label="-- Arena (Large) -- plan view" style="--art:url(data:image/png;base64,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);--ar:520/518"></span><figcaption class="plan__src">Wall blocks &mdash; no single course to trace</figcaption></figure>
   <div class="trk__body">
     <h3>-- Arena (Large) --</h3>
     <p class="trk__key">demoderb</p>
@@ -488,7 +488,7 @@ h1 em { font-style: normal; color: var(--sys); }
       <div><dt>Extent</dt><dd>2000 &times; 1995</dd></div>
       <div><dt>Relief</dt><dd>0</dd></div>
     </dl>
-    <p class="twin">437 of 455 placements are drawn; the rest carry no map art or stand alone off the course</p>
+    <p class="twin">443 of 455 placements are drawn; the rest carry no map art or stand alone off the course</p>
   </div>
 </article>
 <article class="trk" data-tags="later race" data-search="arena -- arena (small) --">
@@ -504,7 +504,7 @@ h1 em { font-style: normal; color: var(--sys); }
       <div><dt>Extent</dt><dd>1844 &times; 1850</dd></div>
       <div><dt>Relief</dt><dd>55</dd></div>
     </dl>
-    <p class="twin">678 of 695 placements are drawn; the rest carry no map art or stand alone off the course</p>
+    <p class="twin">683 of 695 placements are drawn; the rest carry no map art or stand alone off the course</p>
   </div>
 </article></div>
   <p class="empty-state" id="nomatch" hidden>No track matches that.</p>