I've changed tasksubmitter to accept a "thing" and "action" rather than a single URL. This seems more in keeping with
propertyControl, and eliminates the need for loads of
computed properties.
I've also deleted (rather than just commenting out) chunks of the web app that are no longer in use. These may be
reinstated in the future - but we can get them from git
history. It's less confusing not to have vestigial
code in the repo.
This builds OK but is not, as yet, tested with hardware.
Previously, zip files were only downloaded if they already
existed. Now, they are created with an action, then
downloaded from the result.
Chrome now insists on downloading the files as `output.zip`, I can't see why this has changed, but perhaps it's related
to the security warning. This seems to be specific to zip files.
