Support asynchronous path queries.
Allow escaping when stuck in impassable terrain tiles.
Split Update message in multiple phases, to cope with ordering
requirements.
Support automatic walk/run animation switching.
This was SVN commit r8058.
Fix#531 (Enforce Population Limit), based on patch from evans.
Empty training queue and refund resources when buildings are destroyed
or captured.
Specify Cost defaults in XML instead of JS, to simplify some code.
This was SVN commit r8014.
Add short-range vertex-based pathfinder.
Integrate new pathfinder into unit motion code.
Change obstruction system to get rid of circles, and differentiate
structures from units.
Make PositionChanged messages synchronous.
Try to prevent some accidental float->int conversions.
This was SVN commit r7484.
