Add an explicit Load action (#409)

src/actions.h

@@ -77,6 +77,7 @@ enum class Type
 	MoveSelectedItemsDown,
 	MoveSelectedItemsTo,
 	Add,
+	Load,
 	SeekForward,
 	SeekBackward,
 	ToggleDisplayMode,
@@ -606,6 +607,15 @@ private:
 	virtual void run() override;
 };
 
+struct Load: BaseAction
+{
+	Load(): BaseAction(Type::Load, "load") { }
+	
+private:
+	virtual bool canBeRun() override;
+	virtual void run() override;
+};
+
 struct SeekForward: BaseAction
 {
 	SeekForward(): BaseAction(Type::SeekForward, "seek_forward") { }