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/storage/yaml/yaml_datastructs_funcs.cpp

@@ -1298,6 +1298,9 @@ static void r_customFn(void* user, uint8_t* data, uint32_t bitoffs,
     }
     break;
 
+#if defined(COLORLCD)
+  case FUNC_SET_SCREEN:
+#endif  
   case FUNC_HAPTIC:
   case FUNC_LOGS: // 10th of seconds
     CFN_PARAM(cfn) = yaml_str2uint(val, l_sep);
@@ -1472,6 +1475,9 @@ static bool w_customFn(void* user, uint8_t* data, uint32_t bitoffs,
     if (!wf(opaque, str, strlen(str))) return false;
     break;
 
+#if defined(COLORLCD)
+  case FUNC_SET_SCREEN:
+#endif
   case FUNC_HAPTIC:
   case FUNC_LOGS: // 10th of seconds
     str = yaml_unsigned2str(CFN_PARAM(cfn));