keysnail: Import default config
keysnail: Formatting cleanup
keysnail: Use C-h for help
keysnail: Find file/find alternate bindings
keysnail: Use M-g (go to) to focus elements
keysnail: Add a missing undo key
keysnail: Remove silly keybindings
keysnail: Treat switch-to-buffer as switch-tab

This isn't exactly right, as C-x b should prompt for a target, but
there aren't any (reasonable) standard keys for next/previous-buffer.
keysnail: Semi-mnemonic next and prev tab under C-c
keysnail: Use M-g for back/forward