Update 292873 - Linux finally! And various fixes.

- Final fixes for Linux VR. Linux is now supported! Beware that the SteamVR for Linux support is still beta, and not all hardware is supported. See here for how to enable it: http://steamcommunity.com/app/250820/discussions/5/133257636777113042/ Edit: Note that the game is not currently marked in the store as supporting Linux (because this is still a beta). But anyone that owns the game can install it on Linux.- Opening the console was making weapons disappear from hands. Fixed.- Fixed VR controllers being stuck after Alt+Tab sometimes.- Chat console is now properly rendered during loading.- Mixed Reality camera is no longer influenced by mouse movement or controller rotation.- Improved rendering of enemy spawn effect, especially on lower quality settings.- Added a VR "Use" button binding in kbd+m VR so Use no longer collides with the right weapon selection binding.- Added new option in graphics menu to change VR API when using Oculus Rift on Steam.- Left Oculus controller now properly shows hint for the menu button on Steam.- Controller idle detection now only triggers in known idle positions - i.e. when the controller is resting on a horizontal surface.- Various stability fixes and performance improvements in Vulkan.- Cheat to give all Netricsa messages now works.- Fixed player floating up/down in Emulated VR mode.- Fixed some enemies not being able to pass through doors that have a treshold.- Fixed player being able to shoot during cuscenes.- Netricsa wasn't triggered on clients in some cases.- Cheats menu can be invoked through selection wheel and appears as proper translucent menu.- Fixed some switches not synchronizing movement and usage outline correctly.- Better detection for automatic switching between kbd+mouse or gamepad to full VR controllers.