Usability improvements

> 2020-06-10 Eclipse Retriever has now brand new icons and look and feel.

Eclipse Retriever, the old webscrapper written with Eclipse / Java and Sirius technologies to retrieve logos automatically on Countries and regions Android application was becoming too old to be usable. Icons were unclear, technologies outdated, and I didn't remind clearly how it was working myself.

To improve this and making it at least usable on new projects, the icon set used in the retriever has been improved and clarified.

Old version:

New version:

Display of expressions with a lighter color

Red for retriever

Blue for results

Purple for model manipulation tools

> Look at README.md for more details about features.