Feature request: expose hotkeys for configuration

[benjamin-asdf]

[onetom]

Maybe we can just recommend in the documentation to fork Morse and tell which files should be edited, to affect the default bindings. At least as a start.

That way there would be no need to implement any funky layered configuration logic.

[fogus]

A long-term goal would be to extract out the text-editor part of Morse into a separate library that Morse can consume. That would allow us to come up with strategies for configurable key-bindings that are independent from Morse. More thought and investigation needs to happen around this kind of move.