* Add optional momentum events to scroll context
* If there is a velocity, don't snap until momentum end
* Don't show bar on scroll down
* Rm onMomentumBegin
* Add an intermediate List component
* Fix type
* Add onScrolledDownChange
* Port pager to use onScrolledDownChange
* Fix on mobile
* Don't pass down onScroll (replacement TBD)
* Remove resetMainScroll
* Replace onMainScroll with MainScrollProvider
* Hook ScrollProvider to pager
* Fix the remaining special case
* Optimize a bit
* Enforce that onScroll cannot be passed
* Keep value updated even if no handler
* Also memo it
dan