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/FileTreeView.h

@@ -0,0 +1,54 @@
+/*
+ * This file Copyright (C) 2009-2015 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_FILE_TREE_VIEW_H
+#define QTR_FILE_TREE_VIEW_H
+
+#include <QSet>
+#include <QTreeView>
+
+#include "Torrent.h" // FileList
+
+class QSortFilterProxyModel;
+
+class FileTreeDelegate;
+class FileTreeModel;
+
+class FileTreeView: public QTreeView
+{
+    Q_OBJECT
+
+  public:
+    FileTreeView (QWidget * parent=0, bool editable=true);
+    void clear ();
+    void update (const FileList& files, bool updateProperties=true);
+
+    void setEditable (bool editable);
+
+  signals:
+    void priorityChanged (const QSet<int>& fileIndices, int priority);
+    void wantedChanged (const QSet<int>& fileIndices, bool wanted);
+    void pathEdited (const QString& oldpath, const QString& newname);
+    void openRequested (const QString& path);
+
+  protected:
+    bool eventFilter (QObject *, QEvent *);
+
+  private:
+    FileTreeModel * myModel;
+    QSortFilterProxyModel * myProxy;
+    FileTreeDelegate * myDelegate;
+
+  public slots:
+    void onClicked (const QModelIndex& index);
+    void onDoubleClicked (const QModelIndex& index);
+    void onOpenRequested (const QString& path);
+};
+
+#endif // QTR_FILE_TREE_VIEW_H