Use CodeMirror.findModeByName instead of listing aliases

[schneiderfelipe]

This implements the suggestion in a comment of #1061. Basically, all names, modes and aliases of mode/meta.js become supported for identifying languages for syntax highlighting (i.e., JavaScript is understood as javascript, ecmascript, js and node, while HTML can be either html, htmlmixed or xhtml).

The only hard-coded option now is jl, as it became available only recently on codemirror/codemirror5@bd1b7d2.

[fonsp]

Thank you!! And awesome that you contributed to CodeMirror itself.

Are you interested in working on a larger project? We have some codemirror-related projects if you are interested, like:

• Creating a mixed Julia mode that has markdown syntax highlighting inside md""", and mixel html highlingting inside @htl(""" and inside html""".
• Experiment with switching to https://github.com/codemirror/codemirror.next -- one prerequisite is writing a julia mode for the new codemirror lexer. Marijn told me that he would welcome that contribution!
• Implement find-and-replace across cells in Pluto, see stalled Find and replace feature #530
• Context-based code hints, like Deprecate eval and include, and recommend alternatives #279 and detect using Distributed and warn about incompatibility #420 and hopefully a general system that we can use to easily add hints in the future!

Also take a look at https://www.notion.so/Pluto-jl-a9982e79b7bb4c658e6216c15a9d4cab

[schneiderfelipe]

Thank you!! And awesome that you contributed to CodeMirror itself.

Are you interested in working on a larger project? We have some codemirror-related projects if you are interested, like:

* Creating a _mixed Julia mode_ that has markdown syntax highlighting inside `md"""`, and mixel html highlingting inside `@htl("""` and inside `html"""`.

* Experiment with switching to https://github.com/codemirror/codemirror.next -- one prerequisite is writing a julia mode for the new codemirror lexer. Marijn told me that he would welcome that contribution!

* Implement find-and-replace across cells in Pluto, see stalled #530

* Context-based code hints, like #279 and #420 and hopefully a general system that we can use to easily add hints in the future!

Also take a look at https://www.notion.so/Pluto-jl-a9982e79b7bb4c658e6216c15a9d4cab

Nice! I'll take a look at those!