Ignore mp_timelimit in cooperative maps

[ampreeT]

Fixes #230

[Alienmario]

Have you tested this? Does mp_timelimit 0 work?
We may want to eventually have a feature to disable, for custom maps.

[ampreeT]

Have you tested this? Does mp_timelimit 0 work? We may want to eventually have a feature to disable, for custom maps.

Yeah I have tested this with mp_timelimit set to 0/5 and it works.

I've added a new feature called FT_ENABLE_TIMELIMIT which diverts back to mp_timelimit when enabled.

[Alienmario]

Approved

[Alienmario]

@ampreeT I think this could be reverted and +servercfgfile coop.cfg added to script launch parameters instead.

https://developer.valvesoftware.com/wiki/Servercfgfile

This would use the default value of mp_timelimit 0, won't be affected by map changes unless configured by user, and won't be affected by updates to server.cfg.
The launcher uses this method already.