Added GameModeName to Scene
Added function to get number of active scenes
Added logic to level/client loading to enact gameplay mode logic driven by either Scene's GameModeName or project setting's default game mode
Added template module.cs file for module creation and adjusted new module logic in AssetBrowser to create off template
Updated FPSGameplay code to have deathmatchGame mode work with new GameMode logic
Updated EmptyLevel scene to define deathMatchGame as gamemode
Updated FPSGameplay module script to properly client/server initialize
