Hotfixes for Feb 19

- new enemy spawn position system
- unlimited days option removed. We will adjust all game balance around fixed amount of days but you will be able to play in creative mode with sandbox update!
- added levels for enemy units
- player units stuck fix
- enemy units stuck on spawn fix
- siege workshop worker fix
- siege ghost fix
- workers at night assignment fix
- special resource not disappearing fix
- save at night removed (it was not suppose to work at night)
- walls direction save fix
- 2 side wall save fix
- gates weird rotation fixed
- building rotation circle sometimes not disappearing fixed
- and a lot more minor bugs!
- at this moment siege towers and ladder sapawn rule is a bit broken, it will be fixed with next patch!