Unify and improve build of library, tools and tests

[Fantu]

Description

Actually there are minimal and separate cmake in the folders of library tools and tests.

I think that will be good have a complete one in the root folder, that make possibile configure, build and install of all components (or optionally only one or 2 instead).

The complete and better one probably can be done when the project will be in more mature state, but a minimal from main folder using mainly cmake files already done will be useful.

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[SergeiShtepa]

Hi!
@Fantu, It seems to me, that we have achieved this goal.
The changes from 'stable-v2.0' have been moved to 'master'.

[Fantu]

about the build system it can still be improved, improvements I had done I would define as only the essentials

about stable-v2.0 merge to master is good as master it had gotten a little confusing but other changes are needed from a fast look to the commit
I don't have time to deep check and do a PR now, for example one thing in README should be re-adding the part at the top regarding the old module for veeam users