initial commit - contains path finding methods 
path finding : operational !
initial commit - contains path finding algorythme 
test code : displays the path in blue
Some parameters/methods were changed from private to protected to grant EscapeBlock the access
initialization grid removed, resize does all the work from now on
added support for the new EscapeBlock, instead of Block
initialization grid removed, resize does all the work from now on
added support for the new EscapeBlock, instead of Block
debug menu "test" added to test path finding
debug code removed
removed debug messages