Added: Analysis panel which shows the calculated frequency response of the filters for the selected device and channel.

Improved: GUIs of GraphicEQ and Copy command can now be resized
Improved: GraphicEQ GUI can now be zoomed separately in X and Y direction using mouse wheel on rulers. Also now shows values at mouse position.
Fixed: Original APO was not released when E-APO was shutting down, leading to a memory leak.

Editor/AnalysisPlotScene.h

@@ -0,0 +1,41 @@
+/*
+	This file is part of EqualizerAPO, a system-wide equalizer.
+	Copyright (C) 2015  Jonas Thedering
+
+	This program is free software; you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation; either version 2 of the License, or
+	(at your option) any later version.
+
+	This program is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	GNU General Public License for more details.
+
+	You should have received a copy of the GNU General Public License along
+	with this program; if not, write to the Free Software Foundation, Inc.,
+	51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
+#pragma once
+
+#include <vector>
+#include <fftw3.h>
+
+#include "Editor/widgets/FrequencyPlotScene.h"
+#include "helpers/GainIterator.h"
+
+class AnalysisPlotScene : public FrequencyPlotScene
+{
+	Q_OBJECT
+
+public:
+	AnalysisPlotScene(QObject* parent = 0);
+
+	void setFreqData(fftwf_complex* freqData, int frameCount, unsigned sampleRate);
+
+	std::vector<FilterNode> getNodes() const;
+
+private:
+	std::vector<FilterNode> nodes;
+};