Basic configurable keybindings

[chase]

• [ ] Configuration file reader (TOML?)
  • [ ] https://github.com/marzer/tomlplusplus
• [ ] Keybindings
  • [X] Kitty window navigation neighboring_window left/right/top/bottom Not really necessary
  • Things like https://github.com/knubie/vim-kitty-navigator and https://github.com/mrjones2014/smart-splits.nvim already work fine
  • [ ] Exit (currently hard-coded to Ctrl-C)
  • [ ] History back/forward
  • [ ] Copy/paste
  • [ ] Should support binding Mouse-4/Mouse-5, so back/forward can be bound.