Fix faders, z indexing, svg rendering

src/ui/ui_icons.h

@@ -20,7 +20,7 @@ struct UI_IconInfo {
 
 extern UI_IconInfo g_icons[UI_ICON_COUNT];
 
-// Rasterizes all icons into an R8 atlas bitmap.
+// Rasterizes all icons into an RGBA8 atlas bitmap (4 bytes per pixel).
 // Returns malloc'd data (caller frees). Sets *out_w, *out_h to atlas dimensions.
 // icon_size is the pixel height to rasterize each icon at.
 U8 *ui_icons_rasterize_atlas(S32 *out_w, S32 *out_h, S32 icon_size);