1. cvar to set when lvl have to reset - on round end or on map end.
2. !zspawn function for connecting players
3. Function which spawn zombie near other zombie (for ZE)
4. Native - ZP_IsPlayerMotherZombie
5. Native - ZP_MakePlayerZombie
6. Added knockback value to each zombie class
7. Add mother zombie class support
8. Add function tomake one player don't be a mother zombie twice in a row