do not hardcode.

This should fix #5165
(cherry picked from commit 2d110540)

Two bugs:
 - The change filed are not considered as move, they are re-downloaded
   but the old file was not removed from the database. The change in
   owncloudpropagator.cpp takes care of removing the old entries.

 - Next sync would then remove the file in the server in the old folder
   This was not a problem until we start reusing the sync engine, and
   that the _renamedFolders map is not cleared. We were before deleting
   a non-existing file. But now we delete the actual file.

Also improve the tests to be able to do move on the server.
This include support for file id.

Issue #5192
(cherry picked from commit 85b8ab17)

We wwer enot connecting to the right signal from the check server
job, and therefore we were not catching the condition in which the
json was invalid. We would then never terminate the ConnectionValidator job.

Note that instanceNotFound is also emited if there is a network error.

The log looked like this:

10:25:51.247 OCC::CheckServerJob::finished: status.php from server is not valid JSON!
10:25:51.248 OCC::CheckServerJob::finished: status.php returns:  QMap()   QNetworkReply::NetworkError(NoError)  Reply:  QNetworkReplyHttpImpl(0x2b6a790)
10:25:51.248 OCC::CheckServerJob::finished: No proper answer on  QUrl("http://localhost/~owncloud/status.php")
10:26:23.235 OCC::AccountState::checkConnectivity: ConnectionValidator already running, ignoring "owncloud@localhost"
10:26:55.235 OCC::AccountState::checkConnectivity: ConnectionValidator already running, ignoring "owncloud@localhost"
[...]
(cherry picked from commit ff701bd4)

This is not sufficient as it is not working for the Socket API.
Next commit will fix it in another layer.

Also, not ignoring paths that are not inside the folder is wrong
as it might still happen if the name has a different casing

This reverts commit d5a481f1.

(cherry picked from commit 904cd46f)

(cherry picked from commit d5a481f1)

(cherry picked from commit bd7ec196)

If the folder has different case in the settings and in the FS, we should
not ignore all the files. This is important for the files system watcher.

(cherry picked from commit 98268d10)

Missing deleteLater when the CleanupPollsJob aborts.
This is only a problem if the SyncEngine is kept alive a long time. Which is
usually not the case in the configuration where poll jobs are used.

(cherry picked from commit 34650248)

That was an unintentional change in
2662203f

Also expand the test case to cover this.

(cherry picked from commit af9c4d0e)

I got into a situation where the model would endlessly request the directory
contents from the server because we did not notice yet that the server
is actually in maintenance mode while we were expanding the tree view when
changing the tab to the account or when just expanding it by clicking.
(cherry picked from commit 524220d0)

(cherry picked from commit b541fea7)

Fixes #5079

(cherry picked from commit a83c5598)