Provide QUrl to Qt path conversion utils

inline QUrl urlFromLocalPath(QString path)
{
    auto scheme = QStringLiteral("file");

    if (!path.isEmpty() && path.at(0) == ':')
    {
        path.remove(0, 1);
        scheme = QStringLiteral("qrc");
    }

    QUrl url = QUrl::fromLocalFile(path);
    url.setScheme(scheme);

    return url;
}

inline QString localUrlToFilePath(QUrl url)
{
    QString path =
        url.scheme() == QLatin1String("qrc") ? url.path() : url.toLocalFile();

    Q_ASSERT_X(url.scheme() == QLatin1String("qrc") || url.scheme() == QLatin1String("file"),
               "localUrlToFilePath",
               "url conversion to paths only makes sense for local file or qrc urls");

    if (url.scheme() == QLatin1String("qrc"))
    {
        path.prepend(':');
    }

    return path;
}