Licence fix, add SPDX-License-Identifier, remove unused code files

src/panel/MeterPanel.cpp

@@ -1,3 +1,5 @@
+// Copyright (c) Charles J. Cliffe
+// SPDX-License-Identifier: GPL-2.0+
 
 #include "MeterPanel.h"
 #include "ColorTheme.h"

src/panel/MeterPanel.h

@@ -1,3 +1,6 @@
+// Copyright (c) Charles J. Cliffe
+// SPDX-License-Identifier: GPL-2.0+
+
 #pragma once
 
 #include "GLPanel.h"

src/panel/ScopePanel.cpp

@@ -1,3 +1,6 @@
+// Copyright (c) Charles J. Cliffe
+// SPDX-License-Identifier: GPL-2.0+
+
 #include "ScopePanel.h"
 #include "ColorTheme.h"
 

src/panel/ScopePanel.h

@@ -1,3 +1,6 @@
+// Copyright (c) Charles J. Cliffe
+// SPDX-License-Identifier: GPL-2.0+
+
 #pragma once
 
 #include "GLPanel.h"

src/panel/SpectrumPanel.cpp

@@ -1,3 +1,6 @@
+// Copyright (c) Charles J. Cliffe
+// SPDX-License-Identifier: GPL-2.0+
+
 #include "SpectrumPanel.h"
 
 #include <sstream>

src/panel/SpectrumPanel.h

@@ -1,3 +1,6 @@
+// Copyright (c) Charles J. Cliffe
+// SPDX-License-Identifier: GPL-2.0+
+
 #pragma once
 
 #include "GLPanel.h"

src/panel/WaterfallPanel.cpp

@@ -1,3 +1,6 @@
+// Copyright (c) Charles J. Cliffe
+// SPDX-License-Identifier: GPL-2.0+
+
 #include "WaterfallPanel.h"
 
 WaterfallPanel::WaterfallPanel() : GLPanel(), fft_size(0), waterfall_lines(0), waterfall_slice(NULL), activeTheme(NULL) {

src/panel/WaterfallPanel.h

@@ -1,3 +1,6 @@
+// Copyright (c) Charles J. Cliffe
+// SPDX-License-Identifier: GPL-2.0+
+
 #pragma once
 
 #include "GLPanel.h"