Experimental Co-Op support, OMP gamedata

[yohjimane]

This branch contains gamedata edits that are necessary to run co-op and freemp modes.

On this branch it's possible to:

• run a dedicated coop server (hardcoded to Zaton)
• join via client
• players are synced up

to start a dedicated server, run this .bat script in your root stalker dir (wherever fsgame.ltx lives):

start bin\xrEngine.exe -i -fsltx fsgame_server.ltx -dedicated -nosound -start server(all/single/alife/hname=coop_server/portsv=2/portgs=5482/maxplayers=32/etimef=1.0/name=admin/public=1/coop_enabled) client(localhost)

then start openxray, connect to the coop server via the "Multiplayer" option in the main menu.

there is a still a lot of work to be done before coop is actually in a functional state, but you should be able to invite your friends, run around (Zaton only atm), shoot eachother and monsters, and respawn. Doors don't work properly yet, and dialog can still crash the game.

Before this PR is merged, it needs to be pruned to only include necessary changes.