Use enums for most of the rest of the game constants.

This adds an "enum map" type that allows safe usage of an enum to index an array.
(That is, it enforces that the index is of the enum type.)

src/game/boe.main.cpp

@@ -30,6 +30,7 @@
 #include "cursors.hpp"
 #include "prefs.hpp"
 #include "button.hpp"
+#include "tools/enum_map.hpp"
 
 bool All_Done = false;
 sf::Event event;
@@ -66,7 +67,7 @@ std::vector<int> spec_item_array;
 short current_spell_range;
 eGameMode overall_mode = MODE_STARTUP;
 bool anim_onscreen = false,changed_display_mode = false;
-short stat_window = 0;
+eItemWinMode stat_window = ITEM_WIN_PC1;
 bool monsters_going = false,boom_anim_active = false;
 bool finished_init = false;
 
@@ -626,7 +627,7 @@ static cursor_type get_mode_cursor(){
 void change_cursor(location where_curs) {
 	cursor_type cursor_needed;
 	location cursor_direction;
-	extern rectangle win_to_rects[6];
+	extern enum_map(eGuiArea, rectangle) win_to_rects;
 	rectangle world_screen = win_to_rects[WINRECT_TERVIEW];
 	world_screen.inset(13, 13);