Fixing negative game times, fixing game time UI element not stopping when the game is over
Merge branch 'dev' of https://github.com/Mendasp/NS2Plus into dev

Conflicts:
	lua/CHUD_GUIScripts/GUIGameEnd.lua
Merge remote-tracking branch 'origin/master' into dev
Removed IP offset, fixed alpha for enemies on spawning IP
Server restricted options, updated browser for new tag, updated Rant's alien bars, Toggleable ambients.
Fixing sentries not being able to be dropped until after the first sentry battery was built.
Added instant alien bars (thanks kmg!)
Updated changelog.