Give a name to new Characterics enums

[frankonski]

Hopefully a small change that can be cherry-picked into a 1.9.1 release.

Give a type to these enums, so the can be re-used as return type, such as returning the security alarm state itself rather than its integer value:

  Characteristic::SecuritySystemCurrentState::SecuritySystemCurrentStateEnum_t getState() {
    return partitionCurrentState->getVal<Characteristic::SecuritySystemCurrentState::SecuritySystemCurrentStateEnum_t>();
  }

Also allows better Intellisense help when hovering over enum values which now shows:

enum Characteristic::SecuritySystemCurrentState::SecuritySystemCurrentStateEnum_t::DISARMED = 3

or

enum Characteristic::ContactSensorState::ContactSensorStateEnum_t::DETECTED = 0

instead of

enum Characteristic::SecuritySystemCurrentState::<unnamed>::DISARMED = 3

and

enum Characteristic::ContactSensorState::<unnamed>::DETECTED = 0