feat: configurable keyboard shortcuts

[nick42d]

includes large refactor of event system

[nick42d]

TODOs:

• Fix failing tests - note github actions failing too
• Decide on an action parameter (e.g down(5))
• Decide if actions should be an array
• Deduplicate keycommand and keybind modules
• Broaden implementation of Scrollable
• Allow merging of default and non-default config.
• Fix help display for: Missing mode names, contexts (if possible)
• Add comment for where app should restrict access to actions.

[nick42d]

Before merging - fix issue with modal / dominant keybinds - not activating, and hack to activate resulted in loss of list keybinds.

Resolved: Help menu not displaying correctly.
Not resolved: Backspace not displayed correctly, help menu should take over keybinds