add support for QGIS workbench

[nilsnolde]

Lately I've been using qgist workbench plugin, and I see a weird behavior of the routing panel - it is not at all affected by "save workbench", and for some reason disabled from the toolbars - and not appearing in the dockwidgets. I have a tendancy to believe it might be related, but yet again it might be a completly different bug

Originally posted by @idshklein in #30

[nilsnolde]

Hm, are you talking about this one @idshklein ?

https://plugins.qgis.org/plugins/animation_workbench/

[nilsnolde]

I thought it'd be a native QGIS thing that I missed