Start refactor, restructure basic

src/basic/math_int.cpp

@@ -1,23 +1,3 @@
-struct Vec2I {
-    Int x;
-    Int y;
-};
-
-struct Rect2I {
-    Vec2I min;
-    Vec2I max;
-};
-
-union Color {
-    struct {
-        uint8_t r;
-        uint8_t g;
-        uint8_t b;
-        uint8_t a;
-    };
-    uint32_t value;
-};
-
 Vec2I GetSize(Rect2I r) {
     Vec2I result = {r.max.x - r.min.x, r.max.y - r.min.y};
     return result;