Refactor application configuration

• Remove the stateful EverythingHandler and replace it with
  1. a mutable options holder (ApplicationOptions), based on ConfigurableUser for the moment, to be redone later
  2. stateless functions (configure*) that use the options and collect component configuration
• With the new structure, there's effectively a main python script that "runs" the application. Modifying options after that would be impossible.
• It is possible to "override" options like input, by prepending (rather than appending) options files in the list passed to gaudirun.py. See dst_read.qmt and dst_write.qmt for an example.
• "All" lines in a module are collected more explicitly with a new decorator.
• A macro default_ft_decoding_version is defined to streamline setting the value if needed.
• Handling of input raw event is more explicit, streamlining the split raw event case, by requesting specific bank types.
• Input configuration is done with a "global bind" (in configure_input), lifting the need for the main script to do it.
• ...?

WIP because there are bunch of TODOs, leftovers from the refactor and perhaps something I missed in the description. Tests are passing so we should put it in the head slot so we can work on adding the throughput tests.