Use QStandardPaths's DataLocation instead of GenericDataLocation when looking up AppData directory.

GenericDataLocation returns a directory shared by all applications
whereas DataLocation returns an application-specific version.

For example, on OS X, GenericDataLocation returns

    $HOME/Library/Application Support

but DataLocation returns

    $HOME/Library/Application Support/Mumble/Mumble

Fixes #1340
Fix Qt 5 upgrade broke shutdown ask on quit suppression (#1362)

In Qt 5 QApplication no longer has the commitData function previously
overridden to detect system shutdown. Now using commitDataRequest signal
which is available in Qt 4 and 5 on the object instead.
Split up long HEADERS, SOUCES and FORMS lines to improve readability.
Fix channel filtering not working.

Channel filtering broke for windows Snapshots delivered with Qt 5
due to a signature change on the QAbstractView::dataChanged function
overridden in UserView to implement the channel filtering functionality.
See http://qt-project.org/doc/qt-5/sourcebreaks.html#changes-to-qt-widgets .

Fixes #1328 .
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