Draft: Heading: Refactor font size calculation code

ivan tkachenkorequested to merge
(removed):heading-size into master

This commit no longer removes non-privately named function from public API, but at least it isn't being used anywhere in KDE source code.

At this point, this is just a refactoring into a more declarative form + deprecation of the old imperative approach.

Edited by ivan tkachenko

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