Ability to load or set overriding config values to local storage

[leomeloxp]

End users or developers should be able to set local storage entries that get read by the config store instead of the values set by default or programmatically loaded.

A few requirements for this feature are:

• devs should be able to define whether they want to enable cookies overrides;
• devs should be able to set the priority of local storage config values compared to other sources;
• devs should be able to configure a pattern which will be used to set the config values to the cookie storage (something like a prefix to the config key should be sufficient for now)