Added beacon support

[Zeanon]

As more and more people are running beacon, it would make sense to allow people to properly use KlipperScreen with that probe.
These changes just check whether the beacon_calibrate command exists and adjust accordingly. completely backwards compatible, no breaking change.

[alfrix]

As i answered in #1050 there are a lot of extra modules at this point and adding them would quickly result in a big burden, i would prefer sticking to mainline Klipper.

I've seen that fairly recently probe_eddy_current has been added to mainline

maybe the beacon can be configured as one of those?

but it seems that work may not be complete: Klipper3d/klipper#6558

[Zeanon]

Doesn't seem like the best stance since beacon is becoming increasingly popular but can't be merged into mainline due to licensing issues but hey what do I know, I'm just a measily user wanting to properly use my printer.

[alfrix]

I'm just a measily user wanting to properly use my printer.

that's how i started too

let's address the issues: it seems that you are making the BEACON_CALIBRATE a replacement for PROBE_CALIBRATE if it's available, that doesn't sound correct, it would be the same as doing:

[gcode_macro PROBE_CALIBRATE]
rename_existing: PROBE_CALIBRATE_BASE
gcode:
    BEACON_CALIBRATE

at that point i'm just confused on why they haven't registered the command as PROBE_CALIBRATE

in addition you need to add the section name here: (used to show the z_offset in various places)

KlipperScreen/ks_includes/printer.py

Line 233 in 925dbe9

probe_types = ["probe", "bltouch", "smart_effector", "dockable_probe"]

[Zeanon]

that's a good point
Reason for not registering it as a probe is to avoid confusion, according to the beacon devs
Using the wrapper macro is a good idea though.
I might look into what needs to be modified as well to make it work properly, make it an additional method next to probe_calibrate and redo the pr I guess?
Cause since the dockable probe module from DK is in there, I see no reason not to include Beacon as well