This includes `BooleanFragments`, `Slice to compound`,
`Slice apart`, and `Boolean XOR`.
Clean up the tooltips of properties and commands.
Clean up the spacing of the code so that lines aren't very long.
The path to the icons is added to `AppPartGui.cpp`
using `Gui::BitmapFactory().addPath()`, so the icons are found
automatically in their new directories.
to make the BOPTools available in python3 the way to import these tools had to be changed:
old: ```from Part import BOPTools``` -> new: ```import BOPTools```
this is also changed for python2
