Use PascalCase for Qt client filenames

Split FileTree.{h,cc} and FilterBar.{h,cc} files so that each class
is in its own file.

This breaks translations (some classes got renamed => context changed),
to be fixed by next commit (along with Tx sync).

qt/TrackerModel.h

@@ -0,0 +1,48 @@
+/*
+ * This file Copyright (C) 2010-2015 Mnemosyne LLC
+ *
+ * It may be used under the GNU GPL versions 2 or 3
+ * or any future license endorsed by Mnemosyne LLC.
+ *
+ * $Id$
+ */
+
+#ifndef QTR_TRACKER_MODEL_H
+#define QTR_TRACKER_MODEL_H
+
+#include <QAbstractListModel>
+#include <QSet>
+#include <QVector>
+
+#include "Torrent.h"
+#include "TorrentModel.h"
+
+struct TrackerInfo
+{
+    TrackerStat st;
+    int torrentId;
+};
+Q_DECLARE_METATYPE(TrackerInfo)
+
+class TrackerModel: public QAbstractListModel
+{
+    Q_OBJECT
+
+    typedef QVector<TrackerInfo> rows_t;
+    rows_t myRows;
+
+  public:
+    void refresh (const TorrentModel&, const QSet<int>& ids);
+    int find (int torrentId, const QString& url) const;
+
+  public:
+    virtual int rowCount (const QModelIndex& parent = QModelIndex()) const;
+    virtual QVariant data (const QModelIndex& index, int role = Qt::DisplayRole) const;
+    enum Role { TrackerRole = Qt::UserRole };
+
+  public:
+    TrackerModel () {}
+    virtual ~TrackerModel () {}
+};
+
+#endif // QTR_TRACKER_MODEL_H