feat(colorlcd): Special Function to set main screen (#2160)

* 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>

radio/src/lua/api_general.cpp

@@ -2625,6 +2625,7 @@ const luaR_value_entry opentxConstants[] = {
   { "FUNC_RACING_MODE", FUNC_RACING_MODE },
 #if defined(COLORLCD)
   { "FUNC_DISABLE_TOUCH", FUNC_DISABLE_TOUCH },
+  { "FUNC_SET_SCREEN", FUNC_SET_SCREEN },
 
   { "SHADOWED", SHADOWED },
   { "COLOR", ZoneOption::Color },