Add Text rendering

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

CopiumEngine/ext/include/msdf-atlas-gen/rectangle-packing.h

@@ -0,0 +1,19 @@
+
+#pragma once
+
+#include <utility>
+#include "Rectangle.h"
+
+namespace msdf_atlas {
+
+/// Packs the rectangle array into an atlas with fixed dimensions, returns how many didn't fit (0 on success)
+template <typename RectangleType>
+int packRectangles(RectangleType *rectangles, int count, int width, int height, int padding = 0);
+
+/// Packs the rectangle array into an atlas of unknown size, returns the minimum required dimensions constrained by SizeSelector
+template <class SizeSelector, typename RectangleType>
+std::pair<int, int> packRectangles(RectangleType *rectangles, int count, int padding = 0);
+
+}
+
+#include "rectangle-packing.hpp"