change the transfer and resume key position

the new layout is similar to the cme.
a new state is still required while transfering
add the redial key when pressing newcall and transfer
add a new transfer state to dialing
remove a now obsolete comment
update sccp.conf.sample

Add missing configuration options in general section.
handle KEYDEF_DIALINTRANSFER in softkey_status_str
use transferring on subchan instead of device
add a ringout state
remove unused keydef autoanswer
send SCCP_RINGOUT call state
Merge branch 'key-ordering'