[Companion] Show custom channel, G-Var, and Curve names throughout UI. (#4874)

* [Companion] Move RadioData constructor.

* [Companion] Move getCapability(SwitchPositions) to Boards class.

* [Companion] Show custom channel, g-var, & curve names throughout UI; Remove redundant name formatting and other unused functions in ModelPrinter and Helpers; Add CustomFunctionData::isEmpty().

* [Companion] Add LogicalSwitchData::isEmpty().

* [Companion] Fix small bug in HardwarePanel.

* [Companion] Rename logical switches to "LSw##" in selections lists to avoid confusion with "L#" and "LS" hardware controls; remove unused RotaryEncoderString().

companion/src/boards.cpp

@@ -211,6 +211,11 @@ const int Boards::getCapability(Board::Type board, Board::Capability capability)
         return 8;
       else
         return 7;
+    case SwitchPositions:
+      if (IS_HORUS_OR_TARANIS(board))
+        return getCapability(board, Switches) * 3;
+      else
+        return 9;
     case NumTrims:
       if (IS_HORUS(board))
         return 6;