Ace Editor: Add offline assets

[smalos]

Ace requires some other files (themes, extensions, syntax highlighting etc.)

It's probably better to place them in a subfolder within assets/js/

and then replace

'js-ace' => '<script src="assets/js/ace.js"></script>',

with

'js-ace' => '<script src="assets/js/ace/ace.js"></script>',

See discussion

[smalos]

@prasathmani
I submitted the pull request some time ago and I was wondering if you had a chance to review it yet and if there's anything that's unclear or needs clarification. If everything looks good, would it be possible to merge the pull request?

Thank you for your time and consideration.

[dumblob]

I am also interested in merging this (I need a standalone "independent" deployment).

[smalos]

It may be worthwhile to inquire whether there is any interest in developing a fully offline version, or whether the pull request should be closed due to the lack of response

[gerese1]

I am interested in merging this application in an environment without internet.
Thank you

[ner00]

I think it's worth it, but it might also be a good idea to bring the offline branch up to date with the master branch since there is more than a dozen commits in master that have not been pushed to the offline branch.

Edit: there is no conflict with this PR, I proposed #1037 since the offline branch is being neglected a bit.

[ner00]

@smalos I would also encourage updating Ace to the latest version, and mention the version in the commit and PR title so it's easier to track down the line.