FontEditor: Convert mode and transform buttons into toolbar actions

This will let us more easily organize and assign shortcuts to new
modes and transformations as they are built, and it generally looks
more polished as a uniform interface. Also adds a counterclockwise
option to the rotate action, moves Copy as Character to the edit
menu as it doesn't directly impact GlyphEditor, and makes the paint
and move modes exclusive checkables to make the editor's state more
visually obvious.

Userland/Applications/FontEditor/GlyphEditorWidget.h

@@ -21,6 +21,11 @@ public:
         Move
     };
 
+    enum Direction {
+        Clockwise,
+        Counterclockwise
+    };
+
     virtual ~GlyphEditorWidget() override;
 
     void initialize(Gfx::BitmapFont&);
@@ -34,7 +39,7 @@ public:
     void delete_glyph();
     bool is_glyph_empty();
 
-    void rotate_90();
+    void rotate_90(Direction);
     void flip_vertically();
     void flip_horizontally();