[Telepathy] tp-qt4 Observer, Approver, Handler high-level API proposal

[Andre Moreira Magalhaes]

New revised API attached

Changes:
- Updated to spec 0.17.23
- Removed BaseHandlerClient::addRequest/removeFailedRequest
- Added BaseHandlerClient::requestAdded/requestRemoved signals
- Added ChannelDispatchOperation::reject()
- Removed ChannelRequest::proceed
- Some other small changes

I will start implementing this, if anyone has any objection please let 
me know.

BR
Andrunko
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