Add Text rendering

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

CopiumEngine/ext/include/msdfgen/core/equation-solver.h

@@ -0,0 +1,12 @@
+
+#pragma once
+
+namespace msdfgen {
+
+// ax^2 + bx + c = 0
+int solveQuadratic(double x[2], double a, double b, double c);
+
+// ax^3 + bx^2 + cx + d = 0
+int solveCubic(double x[3], double a, double b, double c, double d);
+
+}