Add download/edit/upload button for Micropython scripts

[fietser28]

I would like to have download/edit/upload buttons for the Micropython scripts section in studio. Similar to the LIST possibilities. The possibility to retrieve (specific versions) from GitHub should remain.

If a user wants to make a change to a script on the BB3 or one of the supplied scripts (on GitHub) it is dependent on a local copy of the script: For the supplied script you now have to obtain them from GitHub , that is kind of a hassle for a small local/temporary change.