Update build and ui/menu so its builds with new highligher

[dpvc]

This PR fixes a problem with building the ui/menu component. The components/bin/build command is modified to handle export async function which was causing an error during the build phase. The ts/a11y/sre.ts function also was causing problems when webpacking the ui/menu component. The the SRE functions for the preferences were not being found by webpack for some reason that I could not fully determine. I don't see anything wrong in any of the files, but it seems to be connected to the direct export of those methods in ts/a11y/res.ts, so I've change those to an import followed by exports, which seems to do the trick.

In addition, I've added a generic highlighter in ts/a11y/explorer/Highlighter.ts so that it can work in the absense of an output jax (I have an example in the documentation of a a role-you-own output jax for native MathML that causes an error otherwise).

I also add a new named STATE value in ts/handler/html/HTMLDocument.ts just for convenience, and so that all the default render actions have a named state value.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.69%. Comparing base (351698e) to head (07eae1a).
Report is 2 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #1276   +/-   ##
========================================
  Coverage    86.68%   86.69%           
========================================
  Files          337      337           
  Lines        84105    84110    +5     
  Branches      4750     4752    +2     
========================================
+ Hits         72909    72917    +8     
+ Misses       11173    11170    -3     
  Partials        23       23           

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[zorkow]

lgtm.