Move global click handlers to per-element ones.

In rustdoc's main.js, we had an onclick handler for the whole document
that would dispatch to handlers for various elements. This change
attaches the handlers to the elements that trigger them, instead.
This simplfies the code and avoids reimplementing the browser's bubbling
functionality.

As part of this change, change from a class to an id for help button.

Move the handlers and associated code for highlighting source lines into
source-script.js (and factor out a shared regex).

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