feat(radio,cpn): Updates for new joystick system (#3400)

* Reduce RAM usage for advanced joystick system on radio:
- Don't allocate memory blocks unless joystick mode is being used.
Support multiple radio joystick configurations in Companion:
- Save configured joystick settings by joystick name in Companion settings.
- Save last joystick name used in each profile.
- Reload joystick settings by name when profile is changed.

* Only show configuration for used axes and buttons in Companion.
Send actual number of configured joystick buttons from radio in USB packet.

* Fix issue where USB joystick not recognised if no buttons configured.

* Fix compiler warnings.

* Remove debugging.

* Fix crash in Companion.

* Change channel 8 to type 'dial', workaround for Linux mapping issue.

---------

Co-authored-by: Phil Mitchell <phil.a.mitchell@gmail.com>

companion/src/simulation/joystick.cpp

@@ -167,3 +167,13 @@ int Joystick::getAxisValue(int axis)
   } else
     return 0;
 }
+
+int Joystick::findCurrent(QString jsName)
+{
+  for (int i = 0; i < joystickNames.size(); i += 1) {
+    if (joystickNames[i] == jsName) {
+      return i;
+    }
+  }
+  return 0;
+}