Improved extension robustness

[calpaterson]

Brief overview

AS AN extension user

I WANT the extension to be a bit more robust to failures

SO THAT that it does not, as a whole, crash (individual errors are acceptable)

Additional details

Going to do this by converting all entry points into extension code from the browser from async functions into non-async functions containing a promise chain with a .catch()

• [x] quarchive-options.ts, saveOptions
• [x] quarchive-options.ts, testOptions
• [x] quarchive-options.ts, restoreOptions
• [x] quarchive-sync.ts, main
• [x] quarchive-sync.ts, changedListener
• [x] quarchive-sync.ts, createdListener
• [x] quarchive-sync.ts, removedListener
• [x] quarchive-sync.ts, movedListener
• [x] quarchive-sync-ts, enablePeriodicFullSync