Many Changes and new stuff

IMPORTANT:
Added new feature Formation Mode. Press F to toggle it. In formation mode you can give your units orders. Right now the only order possible is the attack order, but others will follow. Also there will be a possibility to give certain units like archers seperate orders.

New Units:

• Skeletons:
  1. Lancer
• Zombies:
  1. Spear thrower

New Skins:

• Skeletons:
  1. Skeleton with chain mail
  2. Fleshy skeleton with chain mail
• Zombies:
  1. Light armored zombie
  2. Heavy armored zombie

Fixes:

• Changed movement of the AI so that they will walk around each other in a fight.
• Changed Spawn areas of certain buildings to avoid spawn collisions.
• Changed Zombie teleport animation.