[Paraview] Dropping Qt 4 support from ParaView 5.5 onwards

[Utkarsh Ayachit]

Folks,

Continuing with dropping of support for legacy components, I wanted to
raise the question of dropping support for Qt older than 5.6 starting with
ParaView 5.5 (planned for Nov 2017).

Qt 5.6 has been out since March 2016 and is a LTS release. Qt 4 is no
longer maintained and does not support newer macOS versions, Windows 10 or
retina displays. Supporting Qt 4 and 5 together is not only causing code
complexity, but also straining our testing resources.

If there are strong reasons to continue supporting Qt 4 beyond the upcoming
ParaView 5.4 release, please make us aware before June 30, 2017. One can
always use older versions of ParaView, if required.

Utkarsh
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