Merge in softproofing and ocio looks.

These features allow for better workflow in for Print and VFX respectively.
Check https://docs.krita.org/Soft_Proofing on how to use softproofing.

Looks will still need a little note added to Lut management page.

CCMAIL:kimageshop@kde.org
Fixes T2395

Squashed commit of the following:

commit 38c4fc32
Merge: 54776118 e308ed0f
Author: Wolthera van Hovell tot Westerflier <griffinvalley@gmail.com>
Date:   Tue Jun 28 17:46:16 2016 +0200

    Merge branch 'master' into krita-testing-wolthera

commit 54776118
Author: Wolthera van Hovell tot Westerflier <griffinvalley@gmail.com>
Date:   Tue Jun 28 17:43:20 2016 +0200

    Add rant why per-shot looks won't work after wasting afternoon on it.

    The tl;dr is that OCIO's documentation is extremely vague.

    Ref T2337

commit a3b224b6
Author: Wolthera van Hovell tot Westerflier <griffinvalley@gmail.com>
Date:   Fri Jun 24 13:16:01...