Snom 360 IP Phone Firmware 7.3.30

Fixes:

- Added new setting transfer_on_hangup_with_starcode to allow transferring calls on hangup if one call was picked up with PBX starcode. 
- Clean paint area for title (snom370).
- Codec type and TX-RX stats could not be displayed anymore during call at the display.
- Don't handle key event F_LOGOFF_ALL if a line is connected or on hold.
- Don't resend ring command if phone is already ringing even if there is more than one incoming call. 
- Handle action of FKeys only if state isn't mini browser state. 
- Setting Use Speaker Key to Receive Calls is valid for headset key too now. 
- Show LDAP result instead of display name if setting prioritise_pbx_number_lookup is off.
- Send VQ-Report for hanging up on a holding line as well.
- Make re-register after check-sync if necessary. 
- Un-REGISTER sets unregistered identity to inactive.
- Termination of Registration/Subscription initiated by check-sync notify works now.
- Some setting changes were effecting other settings even though they were not changed by the user.