Add support for home-centered inclusion circle fence

[Ryanf55]

Implementation of mavlink/mavlink#2346

Paired with ArduPilot/ardupilot#31064

[srmainwaring]

Would be good if this could be sync'd with the params from the simple cylindrical fence in ArduPilot.

[Ryanf55]

Pulled in Peter's move-home support, cleaned commits. Ready for merge assuming the linters pass.

[peterbarker]

CI must pass

[peterbarker]

CI must pass

[peterbarker]

@Ryanf55 did you re-test this?

[peterbarker]

Throws an error about uploading floating point values when actually used

[Ryanf55]

Throws an error about uploading floating point values when actually used

I fixed in 0e82c65. I'll squash if you are ready for that.
Depending on the order you sent the fence vs list it, you can avoid the bug.
Yes, it seems odd to populate lat/lon there, but you need to do it because display_polyfences_inclusion_circles calls circles_of_type. If you don't populate p.x and p.y for the scaled home value, it shows up at 0,0 global coords.

[peterbarker]

I've adjusted this branch to handle home change slightly differently so we don't need to munge before the map library sees things. Also means we can render the circle in a slightly different colour.

I'm going to merge this if you don't have objections, @Ryanf55 :-)