Beam tilt correction

[johnboiles]

I'm starting to cherry-pick features and fixes from @madgrizzle's fork so that we can get them merged back upstream.

This change is the GroundControl change for beam tilt correction (added to the firmware in MaslowCNC/Firmware#467)

[MaslowCommunityGardenRobot]

Congratulations on the pull request @johnboiles

Now we need to decide as a community if we want to integrate these changes. Vote by giving this comment a thumbs up or a thumbs down. Votes are counted in 48 hours. Ties will not be merged.

I'm just a robot, but I love to see people contributing so I'm going vote thumbs up!

[blurfl]

As I commented on the related
P
R in Firmware, this one might best wait until it is needed in the Kinematics calculations. At that point, it will need documentation on what units to use and how to measure it.

[blurfl]

@BarbourSmith is off line for a couple days, how about closing this for a few days until he gets back?

[johnboiles]

Closing this until @BarbourSmith is back. Let's continue the discussion though.

[johnboiles]

I made whitespace changes and pulled in the top beam tilt into the simulator in the madgrizzle:beam-tilt-correction branch. Github won't let me re-open this PR though since I force pushed (I didn't know it did that)