Keybindings to add empty lines without going into insert mode
Change keys for adding empty lines without going into insert mode

To avoid clashing with `CTRL-L` that clears the search highlighting,
defined by sensible.vim.
Update todo and readme
Merge remote-tracking branch 'origin/master' into tentative-changes
Merge branch 'master' into tentative-changes
Avoid overriding native keybindings for new line without insert mode