GitLab

 Chat Room : Avoid to add a ref when there is no messages on search - Add PDB of liblinphone_tester - Group Chat Message test : Fix memory corruption by moving unref message to a better place - Build group chat secure tester only if Lime X3DH is build - Add Assert to end test if some pointers are null (append when there is an issue with building encrypted room) - add tests on pointers - remove calls cache before destroying factory - ICE : switch stream after handling ice event as it can change it - Fix tests

Adapt doxygen C headers, add UTF8 functions on Chat Message, Chat Rooms, Contents - switch to UTF8 when using xsd, xml

Do not use MainDbChatMessageKey
add resetStorageId in main db event key and use it instead of replacing main db event key  with an empty object

Thanks Simon

Fix bad dynamic cast.
Relax times in testers.

Add linphone_event_remove_custom_header and C++ implementation
Remote unused ChatMessage customHeader code