[CALL] Added proper wait/hold/activate handling

Change-Id: If50f50e2e9c629b2104fe428fba9b1345d71fc14
Fixup! [CALL] Added proper wait/hold/activate handling

Change-Id: I3b935ca58c0e5008127c794cfd9defc0138b38b1
[CALL] Use token field in Callcontext in case of dialing

Change-Id: Ic123c6c0e7004514b56a0fb61362b62ae60e2246
[CALL] Added call error handling

Change-Id: Ife723790f0d0fa15c35a6513423bf4b32abec5ec
[CALL] Fully fixed waiting/active switching

Change-Id: I67c61bac34c9b4bf3d01bb15fb5e926c91ad4b80
Merge pull request #22 from Volk204/jellybean

Last changes to CALL interface