Index Controller Update

[list] [*] upgraded SteamVR version to better support index controllers [*] weapons can now be picked up by either hand [*] shield is changed; once enabled, a small shield will be attached to each hand [*] time attack mode can now be entered in starting room [*] added an exit option to time attack mode [*] removed button reload [*] removed mouse mode [*] removed the ability to activate round shield [/list]