Generic joystick / HOTAS / pedals support: DirectInput 8 layer + capture wizard

Tester ask: configure non-Xbox controllers.  New L4JOY layer (DI8):
enumerates every non-XInput game device (up to 4), DIJOYSTATE2 polling
with range normalization, reacquire-on-loss, 3s hot-plug re-enum.
XInput devices are excluded via the documented RawInput IG_ VID/PID
check (live-verified skipping a real XBOX360 pad -- no double-feed).

bindings.txt grows joydev/joyaxis/joybutton/joyhat rows (device slots
by name substring or ordinal; axes X..RZ/SL0/SL1 with invert/slew/
deadzone; hats as 4-direction buttons with diagonal chords).  PadRIO
runs them through the existing channel/event machinery -- per-binding
edge arrays release automatically on detach (the #24 rule), and a
direct throttle axis maps full lever travel onto the 0..1 channel
while the gait detent still snaps a lever parked in the walk/run dead
band.

BT_JOYCONFIG=1 (joyconfig.bat) runs a console capture wizard: move
each control when prompted (stick/twist/throttle/fire), invert derived
from the move direction, hat look cluster auto-added, output written
between markers in bindings.txt with the rest of the file preserved.

Legacy L4DINPUT DIJoystick (L4CONTROLS=DIJOYSTICK) untouched.
Verified: grammar accept/reject per line, XInput-exclusion live,
30s in-mission no-device polling clean.  Awaiting a tester with real
stick hardware for axis verification.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

tools/mkdist.py

@@ -75,7 +75,8 @@ def main():
     zpath = os.path.join(outdir, name + ".zip")
 
     exes = ["build/Release/btl4.exe"]
-    bats = ["players/play_solo.bat", "players/join.bat", "players/join_lan.bat"]
+    bats = ["players/play_solo.bat", "players/join.bat", "players/join_lan.bat",
+            "players/joyconfig.bat"]
     if steam_on:
         bats.append("players/play_steam.bat")
     for p in exes + bats: