Added new error checks and some helpful misc functions
*****************************

game.h
======================
- Modified levelLoop() & customLevelLoop() to show the error code as well (it looks cool)

maps.h
======================
- enum E_MAP_ERRORS
	- Added
		- E_AIMAP_FILE_DOES_NOT_EXIST
		- E_MAP_AIMAP_SIZE_NOT_EQUAL
		- E_AIMAP_ZONES_LESS_THAN
		- E_AIMAP_ZONES_GREATER_THAN
		- E_ZONES_LESS_THAN_USED
		- E_MORE_THAN_ONE_SCORE_SET
		- E_MORE_THAN_ONE_SPAWN_SET
		- E_NO_PELLETS
- MapValidity
	- Initialized error booleans for the new error values
	- Added errorMessages for all the new error values
- Map
	- Constructor: Added tests & checks for the following errors
		- E_MAP_AIMAP_SIZE_NOT_EQUAL
		- E_NO_PELLETS
	-  processMap(): Added tests & checks for the following errors
		- E_ZONES_LESS_THAN_USED
		- E_MORE_THAN_ONE_SCORE_SET
		- E_MORE_THAN_ONE_SPAWN_SET
	- processAIMap(): Added tests & checks for the following errors
		- E_AIMAP_ZONES_GREATER_THAN
		- E_AIMAP_ZONES_LESS_THAN
		- E_AIMAP_FILE_DOES_NOT_EXIST

otherHelperFunctions.h
=============================
- Added isNumber() & charToNumber()