* lint: Bump eslint-config-etherpad to 1.0.11
* lint: Rerun `eslint --fix` to nuke trailing function call commas
eslint-config-etherpad 1.0.11 changed the comma-dangle rule to
prohibit trailing commas for function arguments. See:
673ab07acf
Re-run the automated fixes to apply the rule change.
This also fixes a few lint issues in changes that were made after
`eslint --fix` was originally run.
1. Introduce contentcollector.js backend tests
1. Fix issue with OL LI items not being properly numbered after import
1. Fix issue with nested OL LI items being improperly numbered on export
1. Fix issue with new lines not being introduced after lists in on import #3961
1. Sanitize HTML on the way in (import)
1. Fix ExportHTML CSS because it needs to support OL > LI > OL not OL > OL [The latter being the correct format]
1. Fix backend tests.
