Add a persistent state option

[Andy-set-studio]

It could be handy for state to persist in local storage. This is especially true for small, PWAs.

Todos

• Add constructor parameter
• Feature detect that storage is available
• Hydrate from local storage on instantiation if enabled
• Self-subscribe to changes and automatically update storage
• Add clear method if the local storage needs clearing for some reason

[MichaelFBA]

This would be a nice feature

[madeInLagny]

Hi, thanks for the great library. Has this persistent state enhancement been considered ?
I am working on a similar feature. The only piece I am missing is to identify which property of the state triggered the change to avoid having to save the whole state object at every update. Any ideas ?