relay: initial DCC implementation work
relay: fix parsing of DCC and add a DCCRequestEvent
relay: more DCC fixes

* fix splitting when file name has quotes around it
* fix SEND command
Merge branch 'develop' into dcc
Merge branch 'develop' into dcc
Merge branch 'develop' into dcc
Merge branch 'develop' into dcc
relay: more work towards implementing DCC
relay: more work towards a DCC CHAT imlementation
relay: add some more methods to dcc events
Merge branch 'dcc' into develop