Fix eslint errors

Fixed some of the most obvious errors provided by the automated patch.

However there are still many items here that need someone with more experience with javascript to evaluate the remaining changes.

Also need to evaluate if the project wants to follow the rules from prettier or not because it makes some sweeping changes to the javascript files.

Replacing jquery's .val() with vanilla .value has some pitfalls to be aware of and I am not qualified to make those decisions so I left those alone.