EnemyHolder added

1. Some changes in Enemy
2. EnemyHolder
Space Enemy

Added Space Enemy (not attack, but soon)
Bugfix
Space Enemy attack path
Enemy now fly to buildings
Add rocket

Also some project refactoring
Merge pull request #5 from kremius/enemy

Enemy
Right rocket shot
Rotating guns
Firethower
Health added (for buildings)

Also blood sprite added, health for enemy incoming
Enemy counter

Also useless dll deleted
Firethrower fix
Added effect system from old project
BLOOD FOR GOD OF BLOOD
Waves implemented

Gun eats power
Merge pull request #6 from kremius/enemy

Enemy