[Paraview-developers] Changing minimum required CMake version to 3.5.1.

[Utkarsh Ayachit]

> "cmake scripts cleaner and more maintainable"?

A few examples:
1. we need to start using interface libraries to cleanup our module
infrastructure. That depends on newer Cmake. Having code for older and
newer versions of Cmake will make that cumbersome, if not impossible.
2. FindQt4 was updated in 3.2 and provides a more consistent interface
with FindQt5.
3. Kits -- the nice to avoid shared library bloat by combing modules
into kits -- requires newer CMake version. I want to enable that by
default in ParaView, but can't until we assume a never version.

I am sure there are others that Ben and others can elaborate on.