This reverts commit 4aa0ee61.

When the time comes to merge dev into master (for real), the
following may be useful:
https://metlos.wordpress.com/2012/01/13/
git-merging-after-a-revert/

Still have some mesh with undo stack and with widget content.

1st we remove original widget, then we disable undo stack, create a copy of widget and make it a tool. Then undo stack enables back. That widget has tool as parent, so we not need to manage him by scene.

Removed memory leak.

UBToolWidget.cpp/.h cleaned too.

Trying to position ToolWidget at the right place to move naturally from widgetitem to toolidget.

The old code has to be removed and remaining bugs fixed.

UBToolWidget API has been deactivated, there is certainly a lot of bugs, code is ugly.
Remember to fix commented sections (forgotten which ones).

Using the preference dialog to store the community username & password + adding arabian translation file