Release 9.2.1: AER v2 support and VR hosting fix for Grounded (Patreon)

This is a maintenance/improvement release.

With previous versions of the mod, Grounded would work fine, even in multiplayer... except when a VR player was hosting the game and at least another player had joined. In that case only, spurious frames would be generated (especially when the other player was moving around the world) leading to jittery afterimages in the headset and bad performance because of the double renderings.

I apologize for not catching that case in my testing. I had tested multiplayer quite extensively, but must have always been creating the game from the flat side. That was a workaround for previous versions BTW, though of course only accessible if at least one of the co-op players was not using VR.

Anyway, since I was revisiting Grounded, I also took the chance to extend AER v2 to it. The game has good performance, even on not-so-stellar hardware, so AER v2 should give you a very smooth, fluid experience.

Remember that AER v2 only works as intended when your GPU has some room to breathe, so for instance if you are using a 90 Hz headset and you find that the game can't maintain a steady 90 fps with "1/2 rate", either lower the graphics options and/or resolution until you consistently hit the 90 fps frame rate target, or switch to "1/3 rate" which will reconstruct 2 out of every 3 frames, thus lowering the frame rate expectation to 60 fps which is a much easier target to meet.

Have fun, and a wonderful (in the literal sense, "full of wonder") 2023 to all of you chaps and ladies!!!