[ImgBot] Optimize images (#875)

*Total -- 94.61kb -> 50.47kb (46.65%)

/assets/graphics/splash_screen/artworks/exuvita.png -- 11.97kb -> 5.72kb (52.26%)
/assets/graphics/splash_screen/artworks/wishdream.png -- 18.44kb -> 9.32kb (49.48%)
/assets/graphics/splash_screen/artworks/uch.png -- 63.71kb -> 34.96kb (45.13%)
/assets/graphics/gizmos/directional_light.svg -- 0.49kb -> 0.48kb (0.6%)

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assets/graphics/gizmos/directional_light.svg

@@ -1 +1 @@
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