Gesture navigation style is in master

[DeepSOIC]

I have made a couple bugfixes to gesture nav style.
https://forum.freecadweb.org/viewtopic. ... 88#p116858

I just tried Gesture navigation. It's not bad, but what bugs me is that once the mouse pointer has gone over an object, the pointer changes to a small hand and won't go back to the standard arrow. I hate it!

git commit 2d614154a49d47ec85805dbb5a58cf95b9834a2b


(couldn' find where)

draggers are used extensively in fem post-processing

git commit 6e39a7872199b18a91b62f686172a68a9f450a3f
This makes gesture navigation compatible with transform widget (the thing that comes up when you double-click a Part Cube in tree), and should also make it compatible with any SoDragger.

Thanks wmayer for merging!