* Added static MusicScanner::readTags( QFileInfo ), returning a variant-map filled with a file's tags. Wrapped by the regular ::readFile( QFileInfo ).
* AudioEngine::play( QUrl ) to directly start playback of a local file (or in the future network urls).
* Support passing a local file as parameter to a running Tomahawk instance, which in turn triggers playback.
* Make sure supported file extensions are case-insensitive.