- Improves animation smoothness
- Changed animation slideup/down animations to use max-height instead of height
to better avoid jutter at the end.
- Cleaned spacing to match page items in books listing.
Animates the height on breadcrumb dropdown menus to transition to the
loaded animations quicker. Includes a new animation helper for doing
similar tasks in future.
- Added fadeIn to animation JS service.
- Updated overlay to use anim service and to recieve a callback for
after-anim actions.
- Updated code editor popup to refresh Codemirror instance layout after
animation has completed.
Fixes#1672
