Convert create scenario dialogs, reimplement part of the scenario creation process, and allow text edit fields to contain default values in the XML definition.

- Note: This does not mean that scenario creation is now possible, since it relies on scenario saving which is still not implemented.

osx/scenedit/scen.core.h

@@ -11,8 +11,8 @@ void edit_horses();
 void edit_add_town();
 void edit_item_placement();
 void edit_scen_details();
-short edit_make_scen_2(short *val_array);
-short edit_make_scen_1(char *filename,char *title,short *grass);
+bool edit_make_scen_2(short& out_w, short& out_h, short& town_l, short& town_m, short& town_s, bool& def_town);
+bool edit_make_scen_1(std::string& filename,std::string& title,bool& grass);
 void edit_scenario_events();
 bool build_scenario();
 void set_starting_loc();