Remaining UML diagrams added and existing ones updated.
Documentation: added the remaining files, but without content so far.
Again another huge update to the documentation.Still incomplete, though.
documentation: removed mutex lock from message structure (was redundantly used with topic lock)
introduced activity diagrams for the publish-subscribe system.(state diagrams are deprecated and will be removed soon)
classdiagrams overhauled:- various modules are split into several files- introduced a functions.iuml as consistent 'library'
updated all file headers to 2019
enhanced UML component diagram
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