Crossfire LUA for Horus (#5190)

Crossfire LUA for Horus (#5190)

* First iteration of the Horus Crossfire LUA

Under development.
- crossfire.lua working and tested with micro TX and micro RX
- devices.lua basic layout working. Work in process:
     - getLastPos which is not available in Horus hard-coded currently. needs to be adjusted
     - Taranis page method replaced by Horus single page approach with 22 lines in 2 columns. Still throws an error message and unclear if 22 lines of settings are enough for all devices and whether different approach will work better.
    - Save menu not tested.

* Working script (tested with MicroTX)

- updated getlastpos and concenated strings instead
- went back to single column and implemented scrolling
- still need to figure out speed (fields are sometimes populated very slowly)