Quaternius weapons, input fixes, sound & path fixes

- Added 6 Quaternius weapon models (Pistol, Revolver, Rifle, Shotgun, P90, SniperRifle)
- Created weapon resource files with balanced stats
- Wired Pistol + Rifle into player.tscn replacing Kenney blasters
- Fixed WASD input (matched input map action names)
- Fixed Escape key toggles mouse capture
- Added Audio autoload singleton
- Fixed broken sound asset paths across all scripts
- Fixed all scene ext_resource text paths (nested under assets/kenney-fps/)
- Fixed all .import source_file paths
- Deleted stale .import files (will be regenerated by editor on open)

export_presets.cfg

@@ -18,15 +18,15 @@ patch_delta_exclude_filters=""
 encryption_include_filters=""
 encryption_exclude_filters=""
 seed=0
-encrypt_pck=true
+encrypt_pck=false
 encrypt_directory=false
-script_export_mode=2
+script_export_mode=1
 
 [preset.0.options]
 
 custom_template/debug=""
 custom_template/release=""
-debug/export_console_wrapper=0
+debug/export_console_wrapper=2
 binary_format/embed_pck=true
 binary_format/architecture="x86_64"
 texture_format/s3tc_bptc=true
@@ -69,9 +69,9 @@ patch_delta_exclude_filters=""
 encryption_include_filters=""
 encryption_exclude_filters=""
 seed=0
-encrypt_pck=true
+encrypt_pck=false
 encrypt_directory=false
-script_export_mode=2
+script_export_mode=1
 
 [preset.1.options]