Created the loadGameMap() function, still incomplete

Although the overall logic of this function is finished, I still need to
write the callbacks for RegionPager's onNew and onDelete.

I've also tested this using a hand written save/index file. I've written
up a map file format by hand, and I'll be implementing it over the next
few commits.

common/utility.hpp

@@ -27,7 +27,9 @@
 int snapToBase(int base, int x);
 std::string truncatePath(std::string pathname);
 
-//fixing a known bug in g++
+//fixing known bugs in g++
 std::string to_string_custom(int i);
 
+int to_integer_custom(std::string);
+
 #endif