Feature/weather wind bearing

[eXtenZy]

Description

Adds wind bearing attribute to the weather device. Accepts a value in degrees(DPT 5.003) and HA converts it into a heading of 1 to 3 letters (N, NW, NNE etc.).
Some KNX weather stations expose wind direction information. This PR enables showing wind direction in HA.

Fixes # (issue)

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Checklist:

• I have performed a self-review of my own code
• The documentation has been adjusted accordingly
• The changes generate no new warnings
• Tests have been added that prove the fix is effective or that the feature works
• The changes are documented in the changelog
• The Homeassistant plugin has been adjusted in case of new config options

[coveralls]

Coverage increased (+0.005%) to 94.932% when pulling 49ef59a on eXtenZy:feature/weather_wind_bearing into bc8a9f7 on XKNX:master.

[farmio]

Thank you very much!