Now that csync builds as C++, this will avoid having to implement
functionalities needed by csync mandatorily in csync itself.
This library is built as part of libocsync and symbols exported
through it.
This requires a relicense of Utility as LGPL. All classes moved into
this library from src/libsync will need to be relicensed as well.
This is a possible fix for #3850, applying custom window flags (http://doc.qt.io/qt-5.8/qt.html#WindowType-enum) on the connection method dialog. These avoid resizing the dialog and displaying a maximize button on OS X and context help button on Windows.
The re-enables the UI, uses Qt API for importing and
stores the certificate/key in the system keychain.
People who had set up client certs need to re-setup the account. This is ok
since it was an undocumented feature anyway.
When connecting to a https:// URL fails, present the user with three
choices:
* Try again with a http:// URL
* Configure client-side TLS certificates
* Go back and enter a different URL
This allows users connecting with an ownCloud server secured with
client-side TLS certificates to start the certificate import wizard
manually instead of relying on a custom server error message.
