New Persist option in variables

[alexiglesias93]

The only available way to persist data in Wized right now is to use cookies.
Cookies are great for many use cases, like storing session IDs, auth tokens, or any other small bits of info.
But they are not great at storing large amounts of data. For that, it's often better to rely on localStorage or sessionStorage.

I think we can provide support for that by simply adding a new Persist option inside the variables panel like this:

Users would be able to select between:

• Local Storage
• Session Storage

If selected, Wized would:

• Handle the serialization of the variable value for the user. No need to JSON.stringify, Wized would automatically do it.
• If a persisted value exists on page load, Wized would use that value instead of the Initial Value.

[alexiglesias93]

Closing this as it was already shipped.