Major code reorganization

This commit only updates the XCode project for the changes.
A later commit each will update it for scons and MSVC.

A few actual changes are mixed in:
- Add a prefix header for a handful of common definitions
- Moved current_cursor into the Cursor class as a static member
- Removed the make_cursor_sword and make_cursor_watch functions
- Include tests in the All target
- Remove redundant -l flags for Common and Common-Party (since they're included in the Link phases anyway)

src/game/boe.town.hpp

@@ -0,0 +1,30 @@
+
+#include <SFML/Graphics.hpp>
+
+void force_town_enter(short which_town,location where_start);
+void start_town_mode(short which_town, short entry_dir);
+location end_town_mode(short switching_level,location destination);  // returns new party location
+void handle_leave_town_specials(short town_number, short which_spec,location start_loc) ;
+void handle_town_specials(short town_number, bool town_dead,location start_loc) ;
+bool abil_exists(eItemAbil abil);
+
+void start_town_combat(eDirection direction);
+eDirection end_town_combat();
+void place_party(short direction);
+void create_out_combat_terrain(short type,short num_walls,bool is_road);
+void elim_monst(ter_num_t which,short spec_a,short spec_b);
+void do_shop(short which,short min,short max,char *store_name);
+void buy_food(short cost,short per,const char* food_name);
+void healing_shop();
+void do_sell(short which);
+void dump_gold(short print_mes);
+void pick_lock(location where,short pc_num);
+void bash_door(location where,short pc_num);
+void erase_specials();
+void erase_out_specials();
+void clear_map();
+void draw_map(bool need_refresh);
+bool is_door(location destination);
+void display_map();
+void check_done();
+bool quadrant_legal(short i, short j) ;