Fixed .gma whitelist being different between game/gmad
Update net.lua - comment typo
Add all missing Portal 2 map icons
Fix more potential crash issues to do with particles
Make particle preview background slightly lighter (32,32,32)
Fixed more crashing issues to do with particles
ClientSignOnStateChanged is no longer called for HLTV clients
util.IsValidModel uses meshcount to determine useless models
If mesh count is 0 - it's a useless model, instead of using hardcoded model name substrings. This fixes certain valid models being unable to be spawned in Sandbox