Improved new uml_dumper extension

[dan-42]

Problem:

• Showed wrong graph when dependencies are more complex before (uml_dumper.hpp ):

Solution:

• rebuilding the dependency graph and then generating plantuml output after (uml_dumper_2.hpp):

Only tested on gcc 8.2.1

I put this here, as I think it might help others! This is not the cleanest or best implementation, but It shows the idea and solves the problem.

[krzysztof-jusiak]

Close it for now as it but @dan-42 I really like it and would love to merge it in if it passes :+1: