Rebindable input: vRIO bindings profile ported, full board coverage

PadRIO now loads bindings.txt (vRIO profile grammar: key/pad/padaxis
lines with toggle, deflect/rate, invert/deadzone options) written
self-documenting with the full default layout on first run. The
default is vRIO board-complete map - number and letter rows are the
MFD banks as printed on the panel, F-keys the secondary/screen
columns, numpad the pilot keypad (0x50-0x5F delivered as arcade RIO
KeyEvents, a new PadRIO capability), Space/arrows the joystick
column - with the desktop driving keys carved out: WASD stick, Q/E
pedals, PgUp/PgDn throttle, B reverse (vRIO gap key; R returns to
its bank). Pad bindings unchanged in spirit, plus Panic on LB and
config on Start/Back; axis signs are encoded in the profile now, so
L4PADFLIP flips on top of it.

Default profile parses with zero rejected lines (68 key buttons, 8
key axes, 12 pad buttons, 5 pad axes); single-player cycle and the
key-bomb tests stay green.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

pack-dist.ps1

@@ -99,15 +99,20 @@ Red Planet 4.12 - desktop prototype
 Run start-windowed.bat (or: rpl4opt.exe -windowed -res 800 600 -egg TEST.EGG).
 No cockpit hardware needed. If there is no sound, run oalinst.exe once.
 
-Controls (XInput controller and/or keyboard):
+Controls (XInput controller and/or keyboard) - EVERY input is
+rebindable: edit bindings.txt beside the exe (written with the full
+documented default layout on first run; delete it to restore).
 
   Left stick / WASD        joystick
   LT / RT   or  Q / E      left / right pedal
   Right stick Y, PgUp/PgDn throttle (holds position)
   A / Space                joystick trigger
-  B / R                    reverse thrust
+  RB / B key               reverse thrust
   DPad / arrow keys        joystick hat (look)
-  Start,Back / F1,F2       config buttons
+  Start,Back / 9,0         config buttons
+  Number+letter rows       MFD bank buttons (as printed on the panel)
+  F1-F12                   secondary / screen columns
+  Numpad                   pilot keypad (0-9, /*-+. = A-E, Enter = F)
   Alt+Q                    abort the mission (score banked)
 
 The full pod cockpit comes up in a single window: three green MFDs