[FR]: Improved zoom capabilities of virtual display about breezy-desktop

[wheaney]

sideview_display_size isn't intended to go over 1.0, but display_zoom is, so it shouldn't be cropped off the edges. I'll look a little closer into this.

[wheaney]

This actually isn't surprising, because sideview existed before smooth follow, so when I built that portion of the shader I didn't think you'd ever be able to see beyond the edge.

[wheaney]

So the problem is this:

1. The virtual_display plugin and shader (IMUAdjust.fx) have the proper logic to do zoom. I actually enable the virtual_display plugin to do smooth follow since smooth follow is just a virtual display that tracks.
2. Since the user isn't actually opting to use virtual_display mode (it's technically not enabled), I ignore all other settings that the IMUAdjust shader has support for, including zoom. I called it "passthrough" for this reason, it's just stealing the screen movement logic and nothing else. The ignoring (or, rather, resetting) of configs is explicitly done here.

Properly enabling zoom would build on this in a way I'm not super fond of by allowing the passthrough mode to utilize a setting from follow mode. I'm not fond of it because it's no longer just a passthrough, but instead is becoming more "aware" of the other mode, and they really should be distinct. I think the proper fix would be to pull the relevant virtual_display bits out into re-usable functions for the follow plugin and shader to use. That's a lot of work for just one setting, though... so maybe we should just go the route of adding it to passthrough mode.