feat: special function to push customisable switches (#5497)

Co-authored-by: philmoz <phil.a.mitchell@gmail.com>
Co-authored-by: elecpower <elecpower@users.noreply.github.com>

companion/src/firmwares/customfunctiondata.h

@@ -73,6 +73,8 @@ enum AssignFunc {
   FuncDisableAudioAmp,
   FuncRGBLed,
   FuncLCDtoVideo,
+  FuncPushCustomSwitch1,
+  FuncPushCustomSwitchLast = FuncPushCustomSwitch1 + CPN_MAX_SWITCHES_FUNCTION - 1,
   FuncCount,
   FuncReserve = -1
 };