NavMesh, unit improved movement and more...

The May was very fruitful for DOReborn project. Unit pathfinding is probably the biggest feature added this month. Along with improved movement it takes into account all walkable terrain on the level now.

The level got deployment zone which does not affect game yet. Also, some basic HUD elements and unit commands were implemented.  

Last but not least is implementation of unit charge maneuver

There are still some minor bugs here and there but with such almighty developer as devast3d they are doomed to be fixed