* fixes#2713
changes:
- use getMultiOptionTitle() instead of rfproto->getOptionStr() as getMultiOptionTitle() takes updated MPM status in account
* code cleanup: removed obsolete functions
* fix#3046
* fixed my complete misunderstanding of how the chosen protocol is updated in Multi DSM auto mode
* removed obsolete check
* update subType list only on rf protocol change
added some comments
* reconsidered implementation utilizing LV_EVENT_REFRESH to avoid sporadic loss of update
* editorial change
* fix problem where a successful MPM DSM2 auto bind would reset the receiver ID
* reset DSM2autoUpdated just in case
