[feature request] Optionally persist item type filters on menus between sessions

[hawkrives]

From a student:

Could the menu filter changes remain between sessions? So, like, if I filter out composed salads, they will remain filtered whenever I open the app in the future (unless I choose to show them again.)

[hawkrives]

I definitely think that this should only apply to certain filters, though. I don't want the "meal selection" filter, for instance, but I'm maybe OK with having the food categories?

[hawkrives]

I think we should add a new key to the filter spec, persist: boolean or something, which will automatically persist that filter's value into AsyncStorage.