Initial implementation of collections API and Tree (#31)
* init setup
* story setup
* Stately collections
* collection view
* Remove some stuff
* Remove ScrollView as super class of CollectionView
* wip - refactor collection view using hooks
* wip
* Moving stuff around, refactoring, CollectionBuilder, and stuff
* Move treeview state into stately
* Linting and stuff
* TreeView -> Tree
* Fix ts error
