Use localstorage

[infamy]

Allow storing the code plug to localstorage for later use.

[infamy]

Not sure that this is the best path. But it would be nice to store a recent read radio in local store to revisit.

[infamy]

I think this sort of goes away with the new codeplug format which is just a zipped json file.. they are SUPER small and fast to load.. but maybe we keep a few in local store so you can zap back in time...