engine: internals supporting the facade migration

UndoStack push_pre_executed, FolderAddChild-based true folder moves,
NodeViewDeleteCommand delete-then-reconnect support, event emission
points for the facade event bus, and related internal adjustments.

engine/render/managedcolor.cpp

@@ -19,50 +19,7 @@
 
 ***/
 
-#include "managedcolor.h"
-
-namespace olive
-{
-
-ManagedColor::ManagedColor()
-{
-}
-
-ManagedColor::ManagedColor(const double &r, const double &g, const double &b,
-						   const double &a)
-	: Color(r, g, b, a)
-{
-}
-
-ManagedColor::ManagedColor(const char *data, const PixelFormat &format,
-						   int channel_layout)
-	: Color(data, format, channel_layout)
-{
-}
-
-ManagedColor::ManagedColor(const Color &c)
-	: Color(c)
-{
-}
-
-const QString &ManagedColor::color_input() const
-{
-	return color_input_;
-}
-
-void ManagedColor::set_color_input(const QString &color_input)
-{
-	color_input_ = color_input;
-}
-
-const ColorTransform &ManagedColor::color_output() const
-{
-	return color_transform_;
-}
-
-void ManagedColor::set_color_output(const ColorTransform &color_output)
-{
-	color_transform_ = color_output;
-}
-
-}
+// ManagedColor has moved to application code
+// (app/widget/manageddisplay/colorprocessorhandle.h) as part of the C ABI
+// migration. This translation unit is intentionally left empty (the file is
+// kept so the existing build rules keep working).