command

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.

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

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

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