Merge branch 'release-0.6.0' into release

Merge branch 'release-0.5.97' into release

Set Mapper version to 0.5.96

Set Mapper version to 0.5.95

3rd-party/qt5: Fix download URL

3rd-party/qt5: No qt5-host-build on APPLE

3rd-party/qt5: Set controlled source code version for release

MainWindow::setController() [OS X]: force menu bar synchronization

After switching the controller, the menu was empty until the user switched to another
window and back. This is probably a QTBUG.

OcdFileImport: Don't create hole point at path start.

Fix [tickets:OpenOrienteering#196] for Mac OS X, too.