Libraries: Create top level directory for libraries.

Things were getting a little crowded in the project root, so this patch
moves the Lib*/ directories into Libraries/.

Libraries/LibGUI/GFontDatabase.h

@@ -0,0 +1,33 @@
+#pragma once
+
+#include <AK/AKString.h>
+#include <AK/Function.h>
+#include <AK/HashMap.h>
+
+class Font;
+
+struct Metadata {
+    String path;
+    bool is_fixed_width;
+    int glyph_height;
+};
+
+class GFontDatabase {
+public:
+    static GFontDatabase& the();
+
+    RefPtr<Font> get_by_name(const StringView&);
+    void for_each_font(Function<void(const StringView&)>);
+    void for_each_fixed_width_font(Function<void(const StringView&)>);
+
+    Metadata get_metadata_by_name(const StringView& name) const
+    {
+        return m_name_to_metadata.get(name);
+    };
+
+private:
+    GFontDatabase();
+    ~GFontDatabase();
+
+    HashMap<String, Metadata> m_name_to_metadata;
+};