add editor support to lilypond-invoke-editor

[Aljoscha Meyer]

Hello,

could you point me to the right direction for adding support for the atom
text editor to the lilypond-invoke-editor script?

The syntax of the command to invoke is simply 'atom file:line:column', e.g.
atom text.ly:42:7

This should be a very small addition to a single script (I'd assume), but
I'm somewhat intimidated by the entry barrier for contributing
http://lilypond.org/doc/v2.19/Documentation/contributor/

Best regards,
Aljoscha