E as editinacme

[rakoo]

In the expected case where the files ends up being edited in acme, do as editinacme does: when the window of the file is closed it means we're done. No need for an extra binary in another repository. The old logic is kept as a backup.

In addition, allow line numbers to be specified in the input (as in E file:13) and still work with both logics.

[rakoo]

For reference lazygit merged a change that can use acme as a preset, and I want to be able to use E as my editor in which case the changes there can be used. I don't want to depend on editinacme so that'd be great

[musvaage]

Is your sed command portable?

[rakoo]

Good call, I'll rework it

[musvaage]

Please don't consider me a Reviewer.

[rakoo]

requires #708

[yrk-lab]

Albeit similar in function, E and editinacme differ quite a bit in how they operate. Sometimes one can be found usable when the other doesn't work, e.g. as a remote command. I'd advocate to rather keep it as is.