fix: support latest UFO 50 builds

[eboody]

Summary

• update build scripts for current UFO 50 Steam depot layouts by discovering audio, texture, font, and localization assets dynamically
• normalize staged asset paths to lowercase and store externally loaded localization/font files uncompressed so Android GameMaker can resolve them
• trim trailing bytes after the GameMaker FORM chunk before packaging game.droid
• patch Steamworks extension metadata during builds with UndertaleModCli so Steam calls route to the Android stub
• add a GameMaker 2024.1400.4.968 Android wrapper patched for Bluetooth controller hotplug detection

Test plan

• bash -n build_linux
• bash -n build_macos.sh
• ./build_linux /home/eran/.local/share/Steam/ubuntu12_32/steamapps/content/app_1147860/depot_1147861
• ./bin/java/bin/java -jar ./bin/apksigner.jar verify --verbose com.unofficial.ufo50.apk
• ./bin/zipalign -c -p 4 com.unofficial.ufo50.apk
• Installed and launched on Android via adb; verified UFO 50 reaches gameplay with no crash log