WIP: Update fix

Got split up into !209 (merged) and !210 (merged)

Resolve issues after updating dependencies

• flutter_i18n on v.0.16.0 does not translate without fallback_key
• hydrated_bloc uses hive. Classes to be serialized need to support hive.

1. • UserBloc
2. • CafeteriaBloc
3. • VCardBloc
4. • HomeBloc
5. • TimelineBloc (AssetImage in TLEntry cannot be possibly persisted via Hive)

• encountered a bug, where reading persisted data yields a TypeError
• cleanup IDs and READ.me of TypeAdapters