Other: fixed case issue in SSL member function names.
Other: removed 'restart' mention in SMTP and IMAP SSL settings.
GODT-1846: modified gRPC server to introduce ConnectionMode settings.
GODT-1846: implemented connection mode handling in bridge-gui.
GODT-1846: implemented error reporting in bridge-gui for connection mode.
Other: gathered all IMAP/SMTP server settings.
GODT-1846: wired IMAP/SMTP port change errors.
Other: Renamed some error events and signals.
Other: Fixed crash in IMAP restart when not started.
Other: dismiss port error notifications before changing ports.
Other: misc. fixes.
