Enable common keyboard hotkey actions for the Edit View 3D

Clicking undo, redo, delete, or save keyboard hotkeys while the Edit View 3D
has focus is working now.

Additionally this commit introduces a generic command for carrying any
variant data from puppet to creator side. This significantly simplifies
and avoids the boiler plate work of sending actions from puppet to
creator side. Current commands can be ported to use this generic
command but this is not part of this commit. Also a similar command to
work the other way around could be implemented.

Task-number: QDS-1266
Change-Id: I40fdf6b215ce77402250a791ea49cbdcd2a9d6eb
Reviewed-by: Miikka Heikkinen <miikka.heikkinen@qt.io>
Reviewed-by: Thomas Hartmann <thomas.hartmann@qt.io>

share/qtcreator/qml/qmlpuppet/instances/nodeinstanceclientproxy.cpp

@@ -72,6 +72,7 @@
 #include "changeselectioncommand.h"
 #include "drop3dlibraryitemcommand.h"
 #include "view3dclosedcommand.h"
+#include "puppettocreatorcommand.h"
 
 namespace QmlDesigner {
 
@@ -262,6 +263,11 @@ void NodeInstanceClientProxy::library3DItemDropped(const Drop3DLibraryItemComman
     writeCommand(QVariant::fromValue(command));
 }
 
+void NodeInstanceClientProxy::handlePuppetToCreatorCommand(const PuppetToCreatorCommand &command)
+{
+    writeCommand(QVariant::fromValue(command));
+}
+
 void NodeInstanceClientProxy::view3DClosed(const View3DClosedCommand &command)
 {
     writeCommand(QVariant::fromValue(command));