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.newgraph.cpp

@@ -27,6 +27,7 @@
 #include "button.hpp"
 #include "res_image.hpp"
 #include "prefs.hpp"
+#include "tools/enum_map.hpp"
 
 short monsters_faces[190] = {
 	0,1,2,3,4,5,6,7,8,9,
@@ -72,7 +73,7 @@ extern bool fog_lifted;
 extern const short alch_difficulty[20];
 extern const eItemAbil alch_ingred1[20];
 extern const eItemAbil alch_ingred2[20];
-extern rectangle win_to_rects[6];
+extern enum_map(eGuiArea, rectangle) win_to_rects;
 
 // Talk vars
 extern eGameMode store_pre_talk_mode;
@@ -88,7 +89,7 @@ std::vector<word_rect_t> talk_words;
 // Shop vars
 extern cShop active_shop;
 extern eGameMode store_pre_shop_mode;
-extern rectangle shopping_rects[8][7];
+extern enum_map(eShopArea, rectangle) shopping_rects[8];
 extern rectangle bottom_help_rects[4];
 extern rectangle shop_name_str;
 extern rectangle shop_frame ;