GitLab

Also requires adding 2 more python modules
* diskcache
* requests_toolbelt

+ Force SMTK builds to build the documentation as this
  includes building code used in the tutorials.
+ Nudge ParaView forward.

This removes all mention of shiboken and qt4.
It also removes the hydrology app bundle, as master should
no longer require separate apps for separate workflows.

Needed by common-superbuild
(see paraview/common-superbuild!215)

Changes made after this commit is for supporting CMB 6.x

Needed for freetype

(cherry picked from commit ebe84d9f)