3.6.0-beta - Device tracking support

Changes in 3.6.0-beta

This PR adds support for device trackers!!! You can now track Bluetooth devices with a public MAC address or static (lifetime) MAC address with BLE monitor.

To enable tracking of a device, add the Bluetooth MAC address to your devices in the options menu and enable the option track device.

Still using YAML?, you can add your device tracker with the following config:

ble_monitor:
  devices:
    - mac: 'D4:3C:2D:4A:3C:D5'
      track_device: True
      tracker_scan_interval: 20
      consider_home: 180

This PR also adds support for the Dutch language