Use npx in package's npm scripts

[lucaperret]

A lot of binaries are call with their full path in the package.json (example).

In case you have the same dependency in the package itself and in the strapi-helper-plugin: it may be relevant if the package version of the called binary is different.
It's not the case in most of places, is there another reason of calling the binaries with their full path ?

It can be less verbose by using the new npm package runner called npx...
npm's blog post about npx.

[mnlbox]

Maybe Related: #742

[lucaperret]

ok, so mine is duplicated.