appending "#debug" to the URL enables it again. Not sure if this
the best mechanism, but better than spaming the console for now.

Add anew one since this adds some default padding and I don't want to
break existing layouts by changing the normal button.

If we figure out a way to keep the layout the same without changing
the padding then we can merge things back.

Also align the mini spinner a bit better with text

These allow linking multiple AbortControllers and ceate a timeout abort signal.

For example in case you want to abort a fetch in case

(1) the UI element gets removed
(2) a newer request replacing this one gets started
(3) a timeout happens because the fetch takes too long

createLinkedAbortController() allows merging multiple signals into one
and createTimeoutAbortSignal() allows creating a singal that auto aborts
after some time passes.

This generalizes the features of the events module and should replace it in the long run.

It allows simple pub/sub and retained events without a centralized instance.

When specifying a package for code splitting, rollup requires the
packages to have a valid entry point for some reason.

Add an empty one.