Most errors highglighted by TS were due to a lack of type definitions
and were ignored by settings types to `any`.
Some minor bugs were resolved where the fix was obvious.
TODO marks left where `any` needs to be later removed or bugfix verified
- tileserver changes use of cache (slightly simplified from callbacks)
- cache methods return promises
- add 'remove' method to cache, with remove_all_at_bbox helper
- from api/building.js, call remove after successful db updates
