gmod_game: Added server tags for modded knife and modded game..

Revision 962
Added server tags for modded knife and modded gamemode scripts.
Moved tag code into tags.lua.
Minor cleanup elsewhere.
Changed Files:
[ul]
[li]garrysmod/gamemodes/terrortown/entities/weapons/weapon_ttt_knife/shared.lua [/li][li]garrysmod/gamemodes/terrortown/entities/weapons/weapon_zm_carry/shared.lua [/li][li]garrysmod/gamemodes/terrortown/gamemode/init.lua[/li][/ul]
Added Files:
[ul]
[li]garrysmod/gamemodes/terrortown/gamemode/crcs.lua [/li][li]garrysmod/gamemodes/terrortown/gamemode/tags.lua[/li][/ul]

Committed By Stefan van der Meer