DBus: allow silencing a call
The UI portion needs !425 (merged) and World/Phosh/libcall-ui!12
This MR is on top of !427 (merged)
Edited by Evangelos Ribeiro Tzaras
The UI portion needs !425 (merged) and World/Phosh/libcall-ui!12
This MR is on top of !427 (merged)