the database ot fix compatibility issues when migrating from release/5.2
- Allow to update participant parameters in DB
- Improve handling of organizer addition and merge into participant if
  it is also specified in the participant list
- Add test to perform migration from DB version 22 of release 5.2 to DB
  version 27 of master

- SQLite doesn't allow to modify contraints of tables therefore a
workaround to do so is to recreate the table from scratch.
The old table is therefore cloned and the values are copied tot he newly
created table.
The cloning is done through the CREATE statement specifying the type of
every column in order to keep it unchanged. If we were to clone and
populate the table in one line using query "CREATE TABLE IF NOT EXISTS
clone AS SELECT * FROM original", we might incur in a data type change.
For example DATE columns are converted to NUM column in the clone table.
The cloned table is populated using the INSERT statememnt and then the
old table can be deleted.
A new table with the desired contraints is then created and populated
one line at a time or in one query.

[MainDb]
- Catch soci exception in the init or updateSchema function and
pass them on to the calling function to be handled.
- Make MainDb::isInitialized() return FALSE if the database
  initialization failed
- In AbstractDb::connect(), catch soci exception and reset DB session if
  they are of type invalid_staement or constraint_violation as an attempt to reconnect to the database won't fix the issue.
- After initializing the database, clean up clone tables in a separate
  SQL statemment to avoid the following error
  'sqlite3_statement_backend::loadOne: disk I/O error while executing "<statement>"'

[MainDbTester]
- Verify that the database has been correctly initialized
- Do not attempt to retrieve data if the database has not been correctly
  initialized

Adapt suites declarations.

- a RecvOnly audio stream with content DTX and the participant label for each participant of the conference. A secured conference will have N audio streams (1 sendrecv for the local participant and N-1 recvonly for the other participants)
- add security level to the conference parameters
- pass security level information to the conference server
- add encryption information to the database table storing conferences
- pass security level down to MSAudioConference and MSVideoConference objects
- add extra video stream for encrypted conference in active speaker layout

- Delete classes IdentityAddress and ConferenceAddress
- Make Address a derived class of HybridObject
- Use smart pointer for objects of Address type whenever they need to be handled by the applications

Add property to disable deletion of empty chatrooms
Enable compiler option '-Wunused-parameter'
Fixed possible null pointer exception in Java wrapper for Android
Update copyright notice in wrapper files

- Rewrite uwp switch
- Fix winsock redefinition
- Add windows switch on headers
- Add static libs in FindSoci search
- Fix cast error

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

(cherry picked from commit ba968163)
(cherry picked from commit 9a36b462)

(cherry picked from commit ba968163)

Fix MainDb tester: it was creating tests accounts for nothing, which takes time and randomize the performance measurements made on the chatroom db loading.

Add RFC4028 support
Complete the tests
Remove a test in call_single_tester
Complete liblinphonecore to allow configuration handling from config files

Move license to GPLv3, update version number to 4.3.0.

Fix crash in maindb tester, and relax wait time in group chat suites because with --parallel mode there were sometimes exceeded.

This reverts commit 1d0495f8.

  - return nullptr if conference factory uri is not set
  - Address object is now more robust
  - remove custom SharedFromThis object
  - CoreAccessor throw exception if core is destroyed
  - Core must be created with a static method
  - Partial fetch of chat message
  - ...