Allow Touch Screen Mod on Horus X10 Transmitters

[MRC3742]

Fixes #4114

Changes to allow the Touch Screen Mod for the Horus X10 Series of Transmitters.
This Mod requires some soldering directly to the MCU processor pins as no other connection points are available!

This is very similar to the already documented Jumper T16 Mod (PR #2060) that has been successfully added to EdgeTX.
The X10 / X10S Standard (NOT EXPRESS) radios need an additional pull down 1K resistor attached to MCU pin 55 (PA6)
This will allow the firmware to pass the PCBREV check as intended to distinguish between Standard or EXPRESS mainboards.

The X10 / X10S EXPRESS radios do not need this additional pulldown as they will already pass the check after installing the Mod.

Rich

[pfeerick]

I'm just going to push a rebase of this to remove the unrelated commits. As a side note, this really should have been targeted for the main branch, not 2.9.

[pfeerick]

@raphaelcoeffic Your thoughts? It looks ok to me, just checking before I press that adorable green button...

[MRC3742]

Thanks - I was trying to rebase this PR and................... well you see what happened !!!

I have also tested this PR using the main branch and it works correctly on my Horus X10 (Now with IPS Touch Screen)

Thanks Again - Rich

[pfeerick]

lol... no problem... rebase can lead to some quite ... interesting... results sometimes.

Glad to hear it, and thanks for the photos and notes in the issue documenting it (will have to add to that to the wiki)... I expect this should be in tomorrow unless some French dude has any grievances... 🤭

[MRC3742]

OK - I'll add a little more detail in that issue documenting the upgrade that is being added 🙏 by this PR.

Rich