Update authors/maintainers

It's better to have up-to-date information about current authors and
maintainers, so that a new contributor know who to contact.

Thanks to Paolo Maggi and Yevgen Muntyan for their past contributions!
Buffer: custom word boundaries for cursor movements

Implement the same word boundaries as in Vim.
Ctrl+Left is like the 'b' Vim command. And Ctrl+Right like 'e'.
Selection with double click works with these custom word boundaries too.

Overrides only word boundaries for cursor movements.