Fix regressions with G/R/S

[0HyperCube]

Closes #3340

[Keavon]

Awesome! I'm especially a fan of the lines-of-code reduction, thank you for cleaning that up. I tested this extensively for you and only found a few minor things needing a fixup before we merge this:

• There seems to be a regression where holding Ctrl for snapping to pixel increments (you'll want to zoom in to about 1000% to see) when using G no longer works, but it does work on master (demonstrated for you in this video):

capture_8_.mp4

• When zoomed at a non-100% scale, the displacement visualization overlays move at the wrong rate for G translation, shown in this video taken from this branch:

asdf.mp4

• Similarly to the previous point, this also seems to affect when the viewport is tilted and using G in unconstrained and locally X/Y constrained modes:

capture_11_.mp4

• When translating with G locked along the local X or Y axis, we'd like the overlay to display the distance moved along that local axis (including any number typed by the user) rather than the X and Y components in document space (at the end of the video below, we see how I type numbers like 50, 150, 100, 500, etc. and it misleadingly shows that for the X and Y components instead of the diagonal/hypotenuse). That way it also matches the visualization of S local scaling for consistency (shown briefly at the local angle's diagonal at the beginning of the video below). See this video taken from this branch:

capture_10_.mp4

Hopefully these are quick fixes. Looking forward to merging this soon, thanks for helping with this!

[0HyperCube]

Thanks for taking the time to record these high quality video files @Keavon.

1. I have now rounded in document coordinates even when you are relative to the viewport / local space
2. I forgot to divide a thing by the viewport scale so it was broken
3. ^
4. Visualisations are part of Local-axis grab (G key) visualization is misaligned #3341 and so out of scope for my PR.

[Keavon]

!build

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[Keavon]

Thank you!