Recompilable-gscs-for-BO2-zombies-and-multiplayer/Plutonium specific gsc-related fixes

Fixed gscs for Plutonium Only:

Audio Announcer Fix

Compile _zm_audio_announcer.gsc and place it in maps/mp/zombies.

This will fix the announcer not having any dialog on all maps and gamemodes.

Tombstone Fix

Compile zm_transit_utility.gsc and place it in maps/mp.

This will allow tombstone to spawn in on dedicated servers.

MP Bots Fix

Compile _bot.gsc and place it maps/mp/bots

This should fix the bots difficulty on dedicated servers.

8 Player Origins Fix

Compile zm_tomb_amb.gsc as zm_tomb_amb.gsc and place it maps/mp

Compile zm_tomb_craftables.gsc as zm_tomb_craftables.gsc and place it maps/mp

Compile zm_tomb_dig.gsc as zm_tomb_dig.gsc and place it maps/mp

This fixes the crashes caused by 8 players on origins