Add .idea_modules/ to .gitignore .
Engine rewritten for future multiverse support.

This code needs refactoring and testing now.
Add submap for demo of jumps and matrix transform.
Fixed walk duration for diagonal moves.
Fix timestamp updates.
Refactoring: removed some unused stuff.
Refactoring: split traversal and render code.
Display game field at center.
Merge pull request #20 from Akon32/multiverse

Engine rewrite for multiverse support