Moved the snapToBase() utility function to region.*pp

I've also adjusted the TODO file, which really shouldn't be committed.
Still, it's there now, so it stays. I don't think the logger is going to
be possible any time soon, so I'll probably look into the disconnection
handler.

common/map/region.cpp

@@ -21,11 +21,13 @@
 */
 #include "region.hpp"
 
-#include "utility.hpp"
-
 #include <stdexcept>
 #include <cstring>
 
+int snapToBase(int base, int x) {
+	return floor((double)x / base) * base;
+}
+
 Region::Region(int argX, int argY): x(argX), y(argY) {
 	if (x != snapToBase(REGION_WIDTH, x) || y != snapToBase(REGION_HEIGHT, y)) {
 		throw(std::invalid_argument("Region location is off grid"));