Add Text rendering

- Add FreeType as dependency
- Add MsdfGen as dependency
- Add MsdfAtlasGen as dependency

CopiumEngine/ext/include/msdf-atlas-gen/Rectangle.h

@@ -0,0 +1,14 @@
+
+#pragma once
+
+namespace msdf_atlas {
+
+struct Rectangle {
+    int x, y, w, h;
+};
+
+struct OrientedRectangle : Rectangle {
+    bool rotated;
+};
+
+}