FolderListModel several bugs

1. URL does not get resolved correctly on [QQuickFolderListModelPrivate::resolvePath] when folder path contains '%' character.
2. Wrong sort order when showDotAndDotDot is true and folder name contains characters '!', '%', etc
3. Some properties does not have NOTIFY parameter.
Example:

UMenuItem

{ property int fieldId: FolderListModel.Name; text: qsTr("name"); checked: folderModel.sortField == fieldId; }

FolderListModel

{ id: folderModel; }

****************************************************
(warning) 12:33:10:552 QQmlExpression: Expression file:///../UFileDialog.qml:43:22 depends on non-NOTIFYable properties:
(warning) 12:33:10:552 QQuickFolderListModel_QML_80::sortField

4. In FileInfoThread::setPath(const QString &path) current watcher's paths shoud be cleared before watcher->addPath.