setup.py: let setuptools generate bin by declaring entry_points

"scripts" folder contain files that can be easily generated by
setuptools since they are merely wrappers to weboob.applications.*.

The whole "scripts" dir can be removed later (with the exception of the
"weboob" script), but it will require weboob developers not to simply
point their PATH to the scripts dir.
10 jobs from setup-deps in 0 seconds (queued for 2876 minutes and 45 seconds)
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doc:2.7
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