rem: SetRGBColor(rgb_color *col,uint8 r, uint8 g, uint8 b, uint8 a=255)
add: SetRGBColor(rgb_color *col,uint8 r, uint8 g, uint8 b, uint8 a)
context: SetRGBColor(rgb_color *col,uint8 r, uint8 g, uint8 b, uint8 a=255){	col->red=r;	col->green=g;	col->blue=b;	col->alpha=a;}