Generate CodeMirror mode from Ace mode as part of automated build

[mojavelinux]

Generate the CodeMirror mode automatically from the Ace mode as part of a build using ace2cm. That way, we aren't attempting to modify auto-generated code.

This will entail setting up a gulp build.

[nerk]

This would be the preferred way to do it. However, the current code is already modified. This is the case with the part of the code contributed by the Ace-mode, as well as the code contributed by ace2cm.

We would need to extract the changes and submit 2 PRs, one to Ace and one to ace2cm. The code change to ace2cm might affect conversion of all other modes as well. I'm not sure if this is really worth the effort.

[mojavelinux]

In light of that information, then I say we can treat it as non-generated code and just continue enhancing it as is. I was suggesting making it a part of the build if the code is 100% generated.

A next step, then, might be to cleanup the formatting so that it is easier to edit.