Refactor lib/* pack

[Crashillo]

Currently we're importing lib/commons in all modules. That contains some generic libraries we must load to make the application run. For the time being, that's ok.

But, at the end, we're importing as well lib/shared, which brings a lot of dead code (JS that won't run in the current page) we actually don't need. As an example, we should copy the logic behind lib/visualizations where we're importing/exporting only those pieces of code we actually must load for the current site.

As a way to proceed, we should go module by module, from the latest (far easier) to the oldest (quite legacy)