Add support for RFC 3680 in linphone-s
- linphone-cmake-builder!136 (merged) (remove ENABLE_REGEVENT)
- linphone-cmake-builder!133 (merged) (add ENABLE_REGEVENT)
- linphone-cmake-builder!132 (merged) (add ENABLE_REGEVENT)
- liblinphone!838 (merged) ( Feature/bad event custom header)
Edited by Timothée Jaussoin