Documentation cleanup

[zorkow]

This cleans up the majority of the jsdoc documentation.

There are still a few jsdoc linter warnings, that have to do with

• missing returns type. These are sometimes too awkward to include, when they are major template types. We should have a think about them.
• some of the parser methods not always returning a result. These needs to be corrected, with accompanying tests.

Also removes unused .eslintrc file and minimizes rule customization.

[dpvc]

This looks good. Thanks for doing all the work on this. I have made a few minor comments and suggestions, but otherwise, ready to go.

[dpvc]

I think this function and filterClassList() below are never actually used. They were meant for the Safe extension to override, but that is done in a different way now, so they are really superfluous, and probably should be removed (together with the calls in this file that go to them).

[zorkow]

I thought they are overwritten in ui/safe extension.

[zorkow]

The lines here and following:

MathJax-src/ts/ui/safe/SafeHandler.ts

Line 94 in 844ad75

if (jax.name.match(/MathML/)) {

[dpvc]

Hmm. I thought I had searched for them, but mist have done it incorrectly. Thanks for finding them.

[zorkow]

Took care of all your points, with the exception of filterAttribute and filterClassList. If they can be removed we can do it in a separate PR.