Unified file readers

[borondics]

I am creating this thread to track multiple discussions with multiple people on the topic.

We are adding more and more file readers and as a result the dropdown list of the widgets gets super long.

To me it seems the best way would be to solve this problem is making a dedicated python module for each instrument manufacturer's readers and then just add that in the Quasar source code. This would enable people to use the readers in other codes that are not based on Orange or Quasar.

This still doesn't handle generic file extensions such as csv or txt, but there we could try the meta readers or going through all specialized readers to see if they can handle that specific file format.

Thoughts?