Add protocol handler
[ #30839 ] Better handling of KeyExchnage categories

This helped discover a serious bug in security handling. It cannot
be explpoited because the feature is downright broken. Will be fixed
next.
[ #30848 ] Make TLS and SRTP feature work again

It was broken since an undocumented daemon syntax change, probably a
long time ago (years?). All security feilds are now validated, everything
is saved correctly and there is now additional protections against this
happening again.
[ #30834 ] Handle password saving correctly depending on the protocol
[ #30916 ] Add auto completion backend