0.5.7B - Fixed unit behavior problems

The updated finally fixes a whole range of unit behavior problems that we attempted to fix in the last update. It also fixes the broken changes made to multiplayer in 0.5.7.

Change log 0.5.7B

Balance changes
- EXPERT difficulty level AI waits slightly longer to unleash first attack and gets slightly less progressively harder for each wave.

Bug fixes
- Fixed a case where a melee unit would attack another unit without being next to the enemy
- Fixed a bug that in rare cases caused units to "skip" a node just before attacking an enemy, leaving it in a slight odd position (like slightly too close or slightly too far away from the enemy unit)
- Fixed a bug that caused a unit that was in the process of chasing a nearby enemy to not get further and seemingly just idle until the enemy unit was killed by another unit
- Unit behavior is no longer broken in multiplayer