after all widgets have been initialized, loop through all widgets

and do some further initialization and information gathering:
- disable mixer and selector widgets that don't have any enabled
  connections
- create lists of analog and digital input and output converters
- find the internal/fixed connection microphone and speaker, and
  which converters they are connected to by default
- create a list of jack sensing capable pins

some of this was already being done in other places, but moved here
for simplification/better organization

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