viewer/various: split off color management into separate base class

Also moves scopes to said base class.

app/widget/scope/waveform/waveform.cpp

@@ -27,10 +27,10 @@
 OLIVE_NAMESPACE_ENTER
 
 WaveformScope::WaveformScope(QWidget* parent) :
-  QOpenGLWidget(parent),
+  ManagedDisplayWidget(parent),
   texture_(nullptr)
 {
-
+  EnableDefaultContextMenu();
 }
 
 void WaveformScope::SetTexture(OpenGLTexture *texture)
@@ -42,6 +42,8 @@ void WaveformScope::SetTexture(OpenGLTexture *texture)
 
 void WaveformScope::initializeGL()
 {
+  ManagedDisplayWidget::initializeGL();
+
   pipeline_ = OpenGLShader::Create();
   pipeline_->create();
   pipeline_->addShaderFromSourceCode(QOpenGLShader::Vertex, OpenGLShader::CodeDefaultVertex());

app/widget/scope/waveform/waveform.h

@@ -21,16 +21,15 @@
 #ifndef WAVEFORMSCOPE_H
 #define WAVEFORMSCOPE_H
 
-#include <QOpenGLWidget>
-
 #include "codec/frame.h"
 #include "render/backend/opengl/openglcolorprocessor.h"
 #include "render/backend/opengl/openglshader.h"
 #include "render/backend/opengl/opengltexture.h"
+#include "widget/manageddisplay/manageddisplay.h"
 
 OLIVE_NAMESPACE_ENTER
 
-class WaveformScope : public QOpenGLWidget
+class WaveformScope : public ManagedDisplayWidget
 {
   Q_OBJECT
 public: