Add Text rendering

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

CopiumEngine/ext/include/msdfgen/core/SignedDistance.h

@@ -0,0 +1,23 @@
+
+#pragma once
+
+namespace msdfgen {
+
+/// Represents a signed distance and alignment, which together can be compared to uniquely determine the closest edge segment.
+class SignedDistance {
+
+public:
+    double distance;
+    double dot;
+
+    SignedDistance();
+    SignedDistance(double dist, double d);
+
+    friend bool operator<(SignedDistance a, SignedDistance b);
+    friend bool operator>(SignedDistance a, SignedDistance b);
+    friend bool operator<=(SignedDistance a, SignedDistance b);
+    friend bool operator>=(SignedDistance a, SignedDistance b);
+
+};
+
+}