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/AddData.h

@@ -0,0 +1,43 @@
+/*
+ * This file Copyright (C) 2012-2015 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_ADD_DATA_H
+#define QTR_ADD_DATA_H
+
+#include <QByteArray>
+#include <QString>
+#include <QUrl>
+
+class AddData
+{
+  public:
+
+    enum { NONE, MAGNET, URL, FILENAME, METAINFO };
+    int type;
+
+    QByteArray metainfo;
+    QString filename;
+    QString magnet;
+    QUrl url;
+
+  public:
+
+    int set (const QString&);
+    AddData (const QString& str) { set(str); }
+    AddData (): type(NONE) {}
+
+    QByteArray toBase64 () const;
+    QString readableName () const;
+
+  public:
+
+    static bool isSupported (const QString& str) { return AddData(str).type != NONE; }
+};
+
+#endif // QTR_ADD_DATA_H