Add Text rendering

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

CopiumEngine/ext/include/msdfgen/core/pixel-conversion.hpp

@@ -0,0 +1,18 @@
+
+#pragma once
+
+#include "arithmetics.hpp"
+
+namespace msdfgen {
+
+typedef unsigned char byte;
+
+inline byte pixelFloatToByte(float x) {
+    return byte(clamp(256.f*x, 255.f));
+}
+
+inline float pixelByteToFloat(byte x) {
+    return 1.f/255.f*float(x);
+}
+
+}