Add Text rendering

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

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

@@ -0,0 +1,19 @@
+
+#pragma once
+
+#include "Rectangle.h"
+
+namespace msdf_atlas {
+
+/// The glyph box - its bounds in plane and atlas
+struct GlyphBox {
+    int index;
+    double advance;
+    struct {
+        double l, b, r, t;
+    } bounds;
+    Rectangle rect;
+
+};
+
+}