Introduce notion of global commands and listen for copy/paste key combos
Listen for commands on channel, and extract functions for handling events/commands
Handle copy command, trivially handle paste by simply printing clipboard contents
Rename draw-selection to draw-selection-outline
Drop comment about event listener registration.

Will make an issue in the repository instead.
Remove the weird translucent rect when making a selection
Don't clear canvas when drawing selection outline
Extract function draw-selection to ensure clipboard contents are drawn on paste
Implement paste command
Don't 'backfill' selection when creating selection via copy/paste
Extract function for handling app-state transactions
Ensure that selection is cleared when switching between frames
Checkin js file for testing