[PATCH] KAboutData: Static license name/text resolvers

[Chusslove Illich]

License information can be contained, as a keyword, in
X-KDE-PluginInfo-License field of .desktop files. Possibly from other
sources too, e.g. Kate scripts/syntax stuff comes to mind. As it is now,
this information is presented as such to the user -- terse and unlocalized.

After some discussion on #kde-devel, we've come to the conclusion -- the way
I interpret it :) -- that it would be nice if KAboutData would provide
static methods which take a license keyword, and return license name/text,
for known licenses. The patch is attached.

The immediate users are KPluginInfo and Plasma::PackageMetadata (though the
latter may inherit from the former in the future). Also the patch to
KPluginInfo, for an example of usage.

-- 
Chusslove Illich (Часлав Илић)
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