CVCenterLoadDialog: cocoa formatting

Signed-off-by: nuss <st9fan@gmail.com>
CVCenterLoadDialog: display IPs in the re-assign list (unfinished)

Signed-off-by: nuss <st9fan@gmail.com>
CVCenterLoadDialog: OSC IP-address dropdown

Signed-off-by: nuss <st9fan@gmail.com>
CVCenterLoadDialog, CVCenter:*loadSetup - allow providing custom a custom IP-address resp. MIDI src-ID
instead of the ones stored with the setup

Signed-off-by: nuss <st9fan@gmail.com>