[obex] First bit of moving bluez-qt to new obex api

- Interface names moved to the generic Obex instead of OrgBluezObex or the old
  OrgOpenobex where easily possible to avoid similar fun if we ever need to
  migrate again; should probably happen for some other ports as well
- SendFiles changed to SendFile, the change is not fully done
  ("Method "SendFile" with signature "a{sv}so" on interface "org.bluez.obex.Client")
  Should be done in a separate patch, after checking if additional work is required
  for session api changes
[libbluez-qt] Complete port to obexd-0.48

Fixes to reflect the API changes in obexd-0.48:

- OPP functionality has moved from ObexClientInterface to a new
  ObexObjectPushInterface class.
- ObexFtp class has been removed; the ObexFileTransfer class, which is
  a direct interface to the dbus API, can be used instead.
- Transfer notifications (progress, complete, etc.) have moved from the
  ObexAgentAdaptor to the ObexTransferInterface
- Various function arguments and return values have changed.
Merge pull request #3 from nemomobile/obex-namespace-changes

Port to obexd-0.48