Widget is deprecated

Widget is deprecated. Use my React Drag/Drop widget instead.
Published again for Mendix 8 for those who already use it.

Small fixes and code cleanup

Thanks to @Andries-Smit and @mrgroen:

• When the there was no context for the draggable widget, an error was throwing. Now the widget will be disabled. (Context is sometimes emptied by the platform when closing an form)
• Remove subscriptions: no data is needed from the context object except for the GUID and type, which will not change even on updates from "subscriptions"
• Remove unused code and formatting
• Update version widget version number and add a test case in the Mendix test project for the empty context

Mx7 fixes

Thanks to Jelle and Jelte for providing the pull request.

Continuation at ITvisors

Continuation of my work, now at ITvisors

Ready for Mendix 7