Font measure

Add install for sound library.

Add github actions..

Main bug is that removals or additions to the widget tree are not
properly reflected in the focuss tree (i.e. out of order)

Added methods to dump tree state to console

Enforced bounds on `create_widget` and `VecTracker`

Also derived traits on Fragment and VecTracker

[RFC 2] Text Measure

Separated `KeyboardInput` into `KeyUp` and `KeyDown` events

Added a bevy feature to kayak_ui.