UI: Key bindings page

[amclain]

We would like to add a page for a user to be able to choose which functionality to bind to which keys. We can start out by getting the list of scan codes from AFK and displaying them in a list for the user to select from.

This is the first iteration of this design and will be expanded on in the future.

Acceptance Criteria

• Layers can be added and removed.
• (Optional) Layers can be renamed.
• A representation of the keyboard shows the mapped keys.
• Selecting a layer shows the key mapping for that layer.
• The user can select a key on the keyboard, and then select the AFK scan code from a list. The code will then be mapped to the key.
• (Optional) A search box narrows down the list of codes.
  • The text in the search box can be cleared by clicking an icon next to it.

Any optional items that are deferred should be tracked in a new ticket.

Design

https://www.figma.com/file/RMYWHeXJoDErWii1jm8C7k/Xebow?node-id=59%3A82