Sprite sheet grid cutter

Cuts a texture arranged in "rows x cols" grid into per-frame source rectangles (Rect). Optional margin (padding around the edges) and spacing (gap between frames), in pixels.

Usage: Shit::SpriteSheet sheet(4, 8, 32, 32); // 4 rows, 8 cols, 32x32 per frame Rect f = sheet.getFrameRect(5); // global frame 5 std::vector<int> walk{0,1,2,3,4,5}; animComp->play("walk", &sheet, walk, 0.1f, true);