* Special Function to set main screen (#2135)
* chore: Add new SF to LUA constants list
* Companion support
* Formatting
* get rid of magic number
* Add function to get the number of custom screens
* Change screen numbering from 0-based to 1-based.
* Allow SetScreen custom function for Color LCD only
* add range protection
* cleanup
* yet, range protection once again
* fix: paintSpecialFunctionLine can't alter SF param data
* Fix screen initialization in companion
* move screen switching to the UI
* Trigger view change from guiMain()
* chore: Change "SET" to "Set" for consistency
* fix: Somehow missed extra comma in `TW`
Co-authored-by: Peter Feerick <peter.feerick@gmail.com>
Co-authored-by: elecpower <neilh713@tpg.com.au>
Co-authored-by: Raphael Coeffic <raphael.coeffic@frafos.com>
