Changed example.map for testing pathfinding.
The old map can be found in test.map
Ugly commit! Contains many hours of work in this single commit. Forgot to keep track..
Some of the changes:

- Pathfinding
	* reworked the algorythm to take walls into account
	* works stable, still uses the whole worldvector
	* the ki only uses it for bringing food back so far

- General changes for testing:
	* only one ant object gets created
	* deactivated / activated some output

- Coding reworked:
	* changed int to size_t for positive counting variables
	* removed some dead code

- Bugfixes:
	* Food can be deleted again
	* Missing piece in sourounding level wall fixed

- New Bugs:
	* Ant texture doesnt rotate right

- A lot of other small stuff I cant remember anymore :p
	-> check diff