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Add experimental wamp support for sr-battery
Update README to include wamp information
Add declarative API to sr-wamp
Improve sr-wamp events
Make battery history use WAMP backend
Increase time it takes for battery to discharge
Temporarily disable battery history

It uses a lot of resources and may not even be necessary in the final
version.
Implement client-side mode pub/sub
Implement mode RPC
Move subscriber and publisher logic into elements
Make mode picker use sr-wamp-publish element
Implement sr-wamp-call element
Change WAMP elements to automatically perform requests
Implement WAMP on zone picker
Add Flask-based HTTP server to work with WAMP
Restore battery, mode and zone capabilities
Add autobahn to .gitignore
Implement logging
Add auto attribute to WAMP elements