More key combinations

[qezz]

• M-DEL aka M-<backspace> to delete a word, equiv to backward-kill-word
• ~M-f, M-b to move one word forward and backward~ It's already there.
• C-t to swap chars, M-t to swap words
• M-d delete word (forward)
• M-g M-g go to line
• C-s to search, or regex search (swiper-like)
• M-; comment/uncomment region
• ...

[qezz]

M-<backspace> etc. is currently not possible due to the upstream implementation of zee's TUI library -- zi

• https://github.com/mcobzarenco/zi/issues/11

/// Input event
#[derive(Debug)]
pub enum Event {
    KeyPress(Key),
}

/// Keyboard input. It aims to match what a terminal supports.
#[derive(Debug, Clone, Copy, PartialOrd, PartialEq, Eq, Hash)]
pub enum Key {
    /// Backspace.
    Backspace,
    /// Left arrow.
    Left,
    /// Right arrow.
    Right,
    /// Up arrow.
    Up,
    /// Down arrow.
    Down,
    /// Home key.
    Home,
    /// End key.
    End,
    /// Page Up key.
    PageUp,
    /// Page Down key.
    PageDown,
    /// Backward Tab key.
    BackTab,
    /// Delete key.
    Delete,
    /// Insert key.
    Insert,
    /// Function keys.
    ///
    /// Only function keys 1 through 12 are supported.
    F(u8),
    /// Normal character.
    Char(char),
    /// Alt modified character.
    Alt(char),
    /// Ctrl modified character.
    ///
    /// Note that certain keys may not be modifiable with `ctrl`, due to limitations of terminals.
    Ctrl(char),
    /// Null byte.
    Null,
    /// Esc key.
    Esc,
}