Add new map mode

[Augustakit]

Scope

Other

Enhancement

I found the following maps and modes although they do not appear in Maplist, or perhaps their paths are similar to those of other modes (e.g. Team Deathmatch). But after my test, it is actually playable.

Use case

Maps and corresponding modes. MP_013 GunMaster0 1 MP_017 GunMaster0 1 MP_Subway GunMaster0 1 XP5_002 GunMaster0 1 XP5_003 GunMaster0 1 COOP_006 TeamDeathMatchC0 1 COOP_006 GunMaster0 1 COOP_002 GunMaster0 1 SP_Jet TeamDeathMatchC0 1 SP_Jet GunMaster0 1 SP_Valley SquadDeathMatch0 1 SP_Valley TeamDeathMatchC0 1 SP_Villa GunMaster0 1

I have checked the following...

• [X] I have read the contribution guidelines on reporting bugs and the code of conduct.