Organize IFEX project into a reusable library

[gunnar-mb]

In the development of AUTOSAR support, it will be necessary to use the "common code" of the Open Source IFEX project as a library. This would be helped by reorganizing this project to separate "common code" and have it presented as a separate python module.

At the same time, the project also needs a little bit of updates and reorganization to be a well-structure python project according to the latest popular python packaging trends.

Relevant link