* Specify user clear events for event upload
* Specify generator clear events
* Specify clear events for user send data
* Specify generic clear on logout for encrypted secret state
* Allow `clearOn`event to be passed into secret state
* Match current data persistence rules
* Clear ui memory on lock + logout
* introduce legacy generators
* introduce generator navigation service
* Introduce default options. These accept a userId so that they can be policy-defined
* replace `GeneratorOptions` with backwards compatible `GeneratorNavigation`
* introduce `GeneratorHistoryService` abstraction
* implement generator history service with `LocalGeneratorHistoryService`
* cache decrypted data using `ReplaySubject` instead of `DerivedState`
* move Jsonification from `DataPacker` to `SecretClassifier` because the classifier
is the only component that has full type information. The data packer still handles
stringification.
