Heartbeat retrieves full bridge state, excl. group 0

[ebaauw]

Currently, homebridge-hue retrieves the full bridge state, GET /, on each heartbeat. As this state doesn't include /groups/0, group 0 is currently not supported. Also, it might be more efficient to issue multiple requests, one for each resource type: GET /lights, GET /groups, GET /sensors, and GET /schedules, especially when you have a lot of rules. Of course, these requests would only be issued when the corresponding resource type is enabled through config.json.

[ebaauw]

homebridge-hue now does separate requests for /lights, /groups/0, /groups, /sensors, /schedules, and /rules, obviously depending in the configuration in config.json. This can be monitored by homebridge -D.