Use homebridge v2.0 dynamic platform accessories

[ebaauw]

Currently, homebridge-zp uses static platform accessories. Using dynamic accessories would enable homebirdge-zp to act on ZoneGroupTopology events (e.g. creating or breaking a stereo pair) without having to restart homebridge.

[ebaauw]

homebridge-zp@1.0.0 uses dynamic platform accessories. New zone player should be exposed automatically, but missing zone players will propably stick around. When leds is set in config.json, slave and satellite zone players are exposed as separate accessories, with only a LightBulb service. Enabling the physical controls is now also support (as Child Lock in Eve, in the accessory screen).

Changes to alarms are detected run time, moving the service to a different accessory, when a different zone (room) has been selected.

[ebaauw]

Still to do:

• Don't lose HomeKit accessories after clearing out cachedAccessories. Technically: delay starting of Homebridge's HAP server, until zone players have been discovered and accessories (re-) created. In v1.0.9.
• Handle bonding of zone players (creating/breaking stereo pairs, home theatre setups);
• Handle changed service type (and characteristic type) in config.json, preserving cached data. Technically: persist service values under key instead of UUID;
• Handle removal of accessories (at least for zone players that are now bonded). What about missing zone players?
• Double-check handling reboot of zone player (need to re-subscribe to events); In v1.1.3.
• Double-check handling changed IP address of zone player; In v1.0.30.
• Double-check handling powering down a zone player - need to mark them unreachable (expose Status Fault for that, like homebridge-hue?). Status Fault and improved re-subscribe logic in v1.4.0-4.
• Only subscribe to ContentDirectory and AlarmService events from one (the "associated") zone player, cf. the Sonos app. Switch associated zone player when previous one goes missing. In v1.4.0-4.
• TV inputs AirPlay, Audio In, and TV In to work on zone rather than on zone group. In v1.0.13.