Related to #304 (closed)

This is a rewrite of our configuration to .toml format.

There is a gargantext-settings.toml_toModify file that you can use as a base template.

Also, there is a CLI subcommand to generate .toml file from your current ini file:

cabal v2-run gargantext-cli -- ini ./gargantext.ini

Tests were fixed accordingly.

Also, because I had problems with tests, I also fixed a long-standing dependency issue in cabal.project: no more allow-newer: *, allow-older: *! I managed to narrow down the dependencies to only the ones that are really required. I also fixed versions in gargantext.cabal file.

Because there are so many changes, it's good to merge this, especially that the tests do pass.