Add De Lijn (Flemish Public Transport) component

[bollewolle]

Breaking Change:

none

Description:

Add De Lijn (the Flemish Public Transport agency) support. The use of the API's of De Lijn does require a subscription key that needs to be added to the configuration. You can register for a free developer account at https://data.delijn.be/ where you can find the subscription key.

Works best with the following custom lovelace card: https://github.com/bollewolle/delijn-card

Related issue (if applicable): fixes #

Pull request with documentation for home-assistant.io (if applicable): home-assistant/home-assistant.io#9507

Example entry for configuration.yaml:

sensor:
  # De Lijn public transport
  - platform: delijn
    sub_key: 'abcdefg'
    nextpassage:
    - stop_id: '200018'
      max_passages: 5
    - stop_id: '201169'
      max_passages: 20

Replace the abcdefg with the API subscription key of De Lijn.
Stop Id's are 6 digit number that can be found at each physical stop of De Lijn in Flanders, but can also be found on their site here: https://www.delijn.be/en/haltes/

Checklist:

• The code change is tested and works locally.
• Local tests pass with tox. Your PR cannot be merged unless tests pass
• There is no commented out code in this PR.
• I have followed the development checklist

If user exposed functionality or configuration variables are added/changed:

• Documentation added/updated in home-assistant.io

If the code communicates with devices, web services, or third-party tools:

• The manifest file has all fields filled out correctly. Update and include derived files by running python3 -m script.hassfest.
• New or updated dependencies have been added to requirements_all.txt by running python3 -m script.gen_requirements_all.
• Untested files have been added to .coveragerc.

If the code does not interact with devices:

• Tests have been added to verify that the new code works.

[MartinHjelmare]

Great!