Adding support for openknx

[iobroker]

Adding support for openknx

[boellner]

Option A

• both results will be presented this way also and user can decide
• cleaner separation and architecture, and I also do not not want to interfere with the knx adapter development
  I will upload my changes then for a review. Had a problem with a blocking license dialog.

[Apollon77]

Normally you add a class here in this repo which is doing the discovery. For knx Adapter this is kind of there already https://github.com/ioBroker/ioBroker.discovery/blob/master/lib/adapters/knx.js ... so I see two options for openknx:

A) We add a second js file with pot your own discovery logic
B) We enhance the existing one and propose knx AND openknx and then user could decide

[boellner]

#203

[boellner]

please review the pull request to proceed here

[Apollon77]

on my list

[boellner]

very good