This PR implements:
* Fade-in transitions when cells load in, making navigation and loading
appear less janky.
* When scrolling, skeleton reps show up before the actual ones load in.
* Resetting filters will also reset any set inclusions or exclusions
This PR adds support for including/excluding specific items from team
filtering. Users can use the filter modal to only show teams that
include specific items, only show teams that _don't_ include specific
items, or combine the two to create a very powerful filter.
