Added EpgSearchFilter criteria for UniqueBroadcastID. Extend implementation of ISerializable in CEpginfoTag.
Add JSON-RPC methods PVR.GetBroadcasts and PVR.GetBroadcastDetails including the needed type and service descriptions.
Bump JSON-RPC version to 6.7.0
Merge pull request #3389 from groth-its/jsonrpc-epg

jsonrpc: basic EPG support