MAINT: Move scripts to (installable) CLI

[pastewka]

We currently have a folder called "scripts" that contains what really are command line helper tools. It would be good to formally have those as command line tools and install them via pip.

Every command will be prefixed with matscipy_ to avoid naming collisions.

[jameskermode]

I'll add the more well-used fracture scripts to this PR before we merge it.

[pastewka]

Okay thanks. Do you agree that we prefix everything with matscipy_? Could also use matscipy-. We could think about a script naming convention, e.g. everything hyphenized: matscipy-average-eam-potential or everything underscores matscipy_average_eam_potential or mixed matscipy_average-eam-potential. Any opinions @jameskermode @jotelha ?

[jameskermode]

I would prefer everything hythenized for command line tools, slightly faster to type. We should be consistent, so we should replace any existing _ with - in the script names.

[pastewka]

Okay, agreed!

[pastewka]

An everything small case, no capital letters?

[jameskermode]

Yes

[jotelha]

Agreed, all hyphenized small case, e.g matscipy-poisson-nernst-planck.