This reverts commit 6324718b.

This reverts commit 3716524b.

Just change all imports and dependencies.

See #43

Takes a package name and a dest path. This way we can more eassily change the
layout and it will error out on package name typos or missing packages.

Add a scope so we don't have to care about naming conflicts
and set the verison to 0.1.0 since we don't have a stable API yet.

We already do all this in createVideoElement

We no logner use that library and the "qr-scanner" altternative turned out to
be better, so remove it completely.

We now queue it and in the callback check if the scan is still active,
and go from there. This means we redraw all the time and detect mostly
in the background.

This results in worse perf with the old library since that isn't async, but
we can always revert if needed.