Do not precache particle materials on the server (game.AddParticles)
Allows particle materials to reach 0 refcount on disconnect from singleplayer, and also makes no sense to precache particle materials serverside anyway.
Show "Unknown Addon #X" as invalid in addons menu
So there's no confusion why they don't appear in-game.
Make sure to restore gamemode on server disconnect to what it was
file.Remove returns success
Potential fix for a sound DSP crash
Prevent NPCs complaining about sequence -1
This could happen when a combine solider has no gun and tries to chase the player.
Fixed NPCs complaining about bone access on death
HL2 model changes
* Moved stalker model to overrides/, next to other override models
* Include EP2 combine mine model, so its skins appear on that EP2 map
* Include EP1 ceiling turret model so it functions correctly when dry firing
Fixed "skill" no doing anything for HL2 content
Also enable Alyx darkness mode
Correct AIClassText for some CLASS_ enums
Also block "skill" from being modified by Lua ( game.SetSkillLevel exists)
Disable .sw.vtx generation in studiomdl.exe
Also made the program work out of the box without specifying `-nop4`.
Minor changes
Fix NPC death poses (Thanks MapBase)
garrysmod-issues/issues/5361
Enabled a bunch more episodic behaviors
Most of it is locked away behind hl2_episodic, most of it is relating to Alyx Darkness mode stuff