feat: non-monospaced fonts support

src/graphics/core/FontMetics.hpp

@@ -1,11 +1,19 @@
 #pragma once
 
+#include <memory>
 #include <string>
+#include <optional>
+
+class Font;
 
 struct FontMetrics {
+    std::optional<std::weak_ptr<Font>> font;
+
     int lineHeight;
     int yoffset;
     int _glyphInterval = 8;
 
+    ~FontMetrics();
+
     int calcWidth(std::wstring_view text, size_t offset=0, size_t length=-1) const;
 };