New/rev card mixing, collapse time and the timeboxing limit are now a
collection property. I appreciate how it could be useful to have those
settings per top-level deck in some cases, but having some settings inherited
from the top level deck makes for a confusing UI.
- allows separate review order for different decks
- makes new card and rev card handling consistent
- for users who find it confusing to have cards from different decks mixed in
and thus click on each deck in turn, they can now just select the parent
deck and have it work as expected
- for users who want their cards mixed together randomly, they can keep the
cards in a single deck
- don't send server graves graves back on the next sync
- make sure we update usns of models/tags/decks as well on upload
- don't die when updating decks after current deck deleted
- report counts when sanity check fails
