feat: add basic map for lighting and shader testing

feat: implement OverlayShader for 'faking' vertex colours on certain external assets

feat: add main theme as mono disc

feat: add WS2_common_car model

feat: update lighting settings and skybox feel

chore: tweak various project settings
Signed-off-by: Jo <johannesreckers2006@gmail.com>

Assets/_MarrowAssets/Levels/Wuhu Island/Sound/static/WS2_title_screen.wav.meta

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