New Krita Stable Branch: krita/4.0

[Boudewijn Rempt]

Hi!

We're going to release Krita 4.0 in two weeks, if all goes well, so I've made 
a Krita 4.0 stable branch. This replaces the old krita/3.3 stable branch. 

I need to find my notes to figure out all the places where this should be 
changed for ci, translations and things like that.

For development, until we release, please do your bug fixes in the branch, and 
make sure those commits are also available in master. Master is now open for 
new stuff, too!

-- 
Boudewijn Rempt | https://www.valdyas.org | https://www.krita.org