Missing Portal 2 Coop functions

[vrad-exe]

This page is missing various functions exclusive to co-op/multiplayer mode, as listed on VDC:

• AddGladosSpokenFlags
• Everything starting with Coop
• GetCameFromLastDLCMap
• GetGladosSpokenFlags
• GetHaveSeenDLCTubesReveal
• GetNumPlayersConnected
• GetPlayerDeathCount
• IsBranchComplete
• IsLocalSplitScreen
• IsPlayerBranchComplete
• NotifySpeedRunSuccess
• SaveMPStatsData
• SetHaveSeenDLCTubesReveal

I would also suggest splitting the page into sections for multiplayer and singleplayer specific functions as I did for the VDC page.