CodeWindow: Eliminate explicit menu item updating from CodeWindow

Gets rid of more menu-related code from CodeWindow and puts it back in
CFrame where it belongs.

This turns the previous menu update function within CodeWindow into one
that simply updates the debugger font for its managed controls. It also
improves how the font is actually updated. Previously, fonts would change,
however this wouldn't actually reflect onto the respective controls until
a refresh or update event occurred. Since codeview, callstack, symbols,
callers, and calls windows are all managed by a wxAuiManager instance,
calling Update() on it after the font has been set will reflect font
changes immediately.

Source/Core/DolphinWX/Debugger/CodeWindow.h

@@ -95,7 +95,6 @@ public:
 
   void Repopulate(bool refresh_codeview = true);
   void NotifyMapLoaded();
-  void UpdateButtonStates();
   void OpenPages();
 
   // Menu bar
@@ -151,6 +150,7 @@ private:
   void StepOut();
   void ToggleBreakpoint();
 
+  void UpdateFonts();
   void UpdateLists();
   void UpdateCallstack();