GenMarkdownTreeCustom has a way to a header (filePrepender arg), however there is not a first class way to add a footer.

Summary

The documentation "activate_announcer_on_command_failure" is not helpful for users as it misses information a

Describe the bug
The first widget added to a UI will be skipped upon cycling.

To Reproduce
Steps to reproduce the behavior:

1. Start the UI, with a couple widgets added one after the other
2. Cycle widgets with the set key
3. The second widget is focused

Expected behavior
The first widget gets focused first, as it was never selected.

result.on(
  success: { 
    greet: -> (first, last) { puts "Hi #{first} #{last}!" },
    print_name: -> (last, first) { puts "#{last}, #{first}!" }
  }
)

Original POC:

https://gist.github.com/serradura/499e403e64d53dfcb8c891dfff594e20

Once #150 is done, add a way to set default switches something like

manager.getContexts().setDefaultSwitch(Residence.class, "res,residence,r");