preferences/colorpaletteeditor(model): Add class comments to headers

src/preferences/colorpaletteeditor.h

@@ -9,6 +9,8 @@
 #include "preferences/usersettings.h"
 #include "util/parented_ptr.h"
 
+// Widget for viewing, adding, editing and removing color palettes that can be
+// used for track/hotcue colors.
 class ColorPaletteEditor : public QWidget {
     Q_OBJECT
   public:

src/preferences/colorpaletteeditormodel.h

@@ -3,6 +3,9 @@
 
 #include "util/color/colorpalette.h"
 
+// Model that is used by the QTableView of the ColorPaletteEditor.
+// Takes of displaying palette colors and provides a getter/setter for
+// ColorPalette instances.
 class ColorPaletteEditorModel : public QStandardItemModel {
     Q_OBJECT
   public: