Tear out most of the legacy code in the PC editor - see below for details

(Scenario Editor is unaffected by this commit.)

- Menubar converted to a .xib file
- Don't include the Info.plist in "Copy Files" stage
- Several more dialogs converted; as before, the source resources have had their resource name changed to the new filename
- One more converted STR# has been included

There were several functions in the PC Editor code that also existed in the BoE game code. I've moved these into the pc.editors.cpp file, so that there's only one copy of each.
- display_alchemy() functions changed signatures
- moved keyToChar() function into a common file (winutil)
- Several constants and globals moved to pc.editors.cpp

Supporting changes to dialog framework:
- New formatting option to set the frame style; this because the PC editor uses a different frame style in some contexts
- Added global default dialog background setting
--> This was necessary to correctly set the default text colour
--> Will also be needed for the scenario editor, which uses a different default background

Other changes:
- Add option to load_scenario to skip loading the strings
- Fix for crash in soundtool in the event of initialization before playing the first sound

osx/boe.items.h

@@ -38,8 +38,6 @@ void make_town_hostile();
 bool display_item(location from_loc,short pc_num,short mode, bool check_container);
 short custom_choice_dialog(std::array<std::string, 6>& strs,short pic_num,ePicType pic_type,std::array<short, 3>& buttons) ;
 //short fancy_choice_dialog(short which_dlog,short parent);
-short char_select_pc(short active_only,short free_inv_only,const char *title);
-short select_pc(short active_only,short free_inv_only);
 short get_num_of_items(short max_num);
 void init_mini_map();
 void put_pc_effects_on_dialog(cDialog& dialog,short item);
@@ -56,3 +54,7 @@ short luck_total();
 cItemRec return_treasure(short loot,short level,short mode);
 void refresh_store_items();
 std::string get_text_response(short dlg,short parent_num);
+
+// These are defined in pc.editors.cpp since they are also used by the character editor
+short char_select_pc(short active_only,short free_inv_only,const char *title);
+short select_pc(short active_only,short free_inv_only);