changelog for KF 5.3

[David Faure]

Here's what I wrote from the changes in git (the CHANGELOG keyword isn't used 
enough yet...)

Please tell me about anything I missed.

I am especially unsure about KTextEditor (so many changes!), KService (I guess 
a better description of the KPluginInfo changes could be useful)
and plasma-framework (I didn't even try for that one).

-- 
David Faure, faure at kde.org, http://www.davidfaure.fr
Working on KDE Frameworks 5
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