FloatingGlucose v.1.3.0-Alpha: Move logic to Plugins

This Release implements the concept of datasource plugins.
There are currently two supported types of datasources:

• Standard Nightscout URL datasource
• Nightscout Dumps on File (new)

The new nightscout dump requires some explanation. Mainly used for debugging, this allows you to load a datafile with nightscout json data into the application.

First, to download your current nightscout data in json format, please go to https://byoursite.azurewebsites.net/pebble?count=2&units=mmol in a browser and save the contents to a file, for example c:\temp\nightscout.nsdata.dump.

Then, select the datasource plugin in the settings and click the new "Browse.."-button to select the previously saved dump: