Added Panzer4

German medium tank (Free)

Added new characters:

- US Machinegunner (Free)
- US AT Infantry (Free)
- US Marksman (Free)
- German Machinegunner (Free)
- German AT Infantry (Free)
- German Marksman (Free)
- USSR Marksman (Free)
- USSR Elite Machinegunner
- USSR Elite AT Infantry

Unlock:

- USSR Rifleman
- USSR Assault
- USSR Engineer
- USSR Machinegunner
- USSR Officier
- USSR Marksman

Added Tower System

- Added towers on map

Network optimization

- Fixes bugs, optimization