Add Text rendering

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

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

@@ -0,0 +1,35 @@
+
+#pragma once
+
+#include <cstdlib>
+#include <set>
+#include "types.h"
+
+namespace msdf_atlas {
+
+/// Represents a set of Unicode codepoints (characters)
+class Charset {
+
+public:
+    /// The set of the 95 printable ASCII characters
+    static MSDF_ATLAS_PUBLIC const Charset ASCII;
+
+    /// Adds a codepoint
+    void add(unicode_t cp);
+    /// Removes a codepoint
+    void remove(unicode_t cp);
+
+    size_t size() const;
+    bool empty() const;
+    std::set<unicode_t>::const_iterator begin() const;
+    std::set<unicode_t>::const_iterator end() const;
+
+    /// Load character set from a text file with the correct syntax
+    bool load(const char *filename, bool disableCharLiterals = false);
+
+private:
+    std::set<unicode_t> codepoints;
+
+};
+
+}