Rename headers to end with _p.h

Frameworks have a convention of naming uninstalled headers in src/ with
a _p at the end of the name, to make it clear they are not part of the
API. None of the headers in KImageFormats are installed, so it is not
really necessary to follow this convention, but we follow it anyway for
the benefit of both humans and tools (like kapidox).

src/imageformats/ras_p.h

@@ -0,0 +1,38 @@
+/* This file is part of the KDE project
+   Copyright (C) 2003 Dominik Seichter <domseichter@web.de>
+   Copyright (C) 2010 Troy Unrau <troy@kde.org>
+
+   This program is free software; you can redistribute it and/or
+   modify it under the terms of the Lesser GNU General Public
+   License as published by the Free Software Foundation; either
+   version 2 of the License, or (at your option) any later version.
+*/
+
+#ifndef KIMG_RAS_H
+#define KIMG_RAS_H
+
+#include <QImageIOPlugin>
+
+class RASHandler : public QImageIOHandler
+{
+public:
+    RASHandler();
+
+    virtual bool canRead() const;
+    virtual bool read(QImage *image);
+
+    static bool canRead(QIODevice *device);
+};
+
+class RASPlugin : public QImageIOPlugin
+{
+    Q_OBJECT
+    Q_PLUGIN_METADATA(IID "org.qt-project.Qt.QImageIOHandlerFactoryInterface" FILE "ras.json")
+
+public:
+    virtual Capabilities capabilities(QIODevice *device, const QByteArray &format) const;
+    virtual QImageIOHandler *create(QIODevice *device, const QByteArray &format = QByteArray()) const;
+};
+
+#endif // KIMG_RAS_H
+