Refactor Occupancy/Presence Sensors

[CarsonF]

Depends on #110

Zones now have their own occupancy/presence sensors. Roode's sensor just unions them now.

binary_sensor:
  - platform: roode
    presence:
      name: $friendly_name Presence
    zones:
      entry:
        presence:
          name: $friendly_name Entry Presence
      exit:
        presence:
          name: $friendly_name Exit Presence