graphics: refactor Color to a standalone file

graphics/color.h

@@ -0,0 +1,30 @@
+#pragma once
+
+#include "../main.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+// HelosGraphics_Color is in ARGB little-endian packed format
+// (B,G,R,A in byte order)
+typedef struct {
+	uint8_t B, G, R;
+	uint8_t A;
+} PACKED HelosGraphics_Color;
+
+extern const HelosGraphics_Color
+	HelosGraphics_Color_Black,
+	HelosGraphics_Color_White,
+	HelosGraphics_Color_Red,
+	HelosGraphics_Color_Green,
+	HelosGraphics_Color_Blue,
+	HelosGraphics_Color_Cyan,
+	HelosGraphics_Color_Magenta,
+	HelosGraphics_Color_Yellow;
+
+
+#ifdef __cplusplus
+}
+#endif