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.hpp

@@ -33,6 +33,9 @@ constexpr int REGION_DEPTH = 3;
 //the size of the solid map
 constexpr int REGION_SOLID_FOOTPRINT = ceil(REGION_WIDTH * REGION_HEIGHT / 8.0);
 
+//utility function
+int snapToBase(int base, int x);
+
 class Region {
 public:
 	typedef unsigned char type_t;