Design a new common datastore.

[janiversen]

We are in the progress of designing a new datastore, with the aim of combining simulator and server.

• The old datastores should automatically generate the new datastore (minimize app changes)
• The simulator json is used as guideline, but need to be heavily simplified
• Fixed actions (like counter etc) should be allowed
• Allow callback to get data for a set of registers (advanced usage)
• External API to allow modify values

We would very much like input for people using the datastore and/or simulator.

Target is probably 4.0 !