Early Access Small Update #2

Changelog:

[Performance]

• Added an experimental launch option for OpenXR runtime which hopefully has better performance
• OpenVR is still recommended for Valve Index due to OpenXR not supporting finger tracking

[Gore Updates]

• Slicing or otherwise fracturing enemy heads no longer forces their eyes to pop out

[Miscellaneous fixes]

• Slow motion upgrades fixed, previously they were stuck on a level somewhere in the middle between the lowest and highest levels