Close #1018

Run the command as is in cmd.exe with no parsing and escaping.
Explicity set cmd.SysProcAttr so execCommand does not escape the command.
Technically, the command should be escaped with ^ for special characters,
including ". This allows cmd.exe commands to be chained together.

See https://github.com/neovim/neovim/pull/7343#issuecomment-333350201

This commit also updates quoteEntry to use strings.Replace instead of
strconv.Quote which escapes more than \ and ".

Remove code that is no longer relevant after the removal of ncurses
renderer. This commit also fixes background color issue on tcell-based
FullscreenRenderer (Windows).

Close #1046

One can escape meta characters in extended-search mode with backslashes.

  Prefixes:
    \'
    \!
    \^

  Suffix:
    \$

  Term separator:
    \<SPACE>

To keep things simple, we are not going to support escaping of escaped
sequences (e.g. \\') for matching them literally.

Since this is a breaking change, we will bump the minor version.

Close #444

Close #995

I was too quick to release 0.16.9, this commit makes --ansi processing
even faster.

When --with-nth is used, fzf used to preprocess each line and store the
result as rune array, which was wasteful if the line only contains ascii
characters.

- Fix incorrect display of the last line when more than a line is
  wrapped above
- Avoid unnecessary flickering of the window

Related: https://gist.github.com/junegunn/4963bab6ace453f7f529d2d0e01b1d85

Close #974

By not storing item index twice, we can cut down the size of Result
struct and now it makes more sense to store and pass Results by values.
Benchmarks show no degradation of performance by additional pointer
indirection for looking up index.

With zero result.

Related: https://github.com/junegunn/fzf.vim/issues/22#issuecomment-311869805

Close #928

    # Move cursor to the top result whenever the query string is changed
    fzf --bind change:top

Close #925

https://github.com/junegunn/fzf.vim/issues/361

Do not automatically decide to use alternate screen when the value of
height exceeds the height of the terminal.

    # Use alternate screen
    fzf
    fzf --height 100%
    fzf --no-height

    # Still use current screen
    fzf --height 10000

This is to address a common confusion that one does not realize that
sorting is intentionally turned off by default and can be enabled by
a bind key.

This is needed when fzf is started from inside a program (e.g. Vim)
and it uses a different background color than the terminal.

- https://github.com/junegunn/fzf.vim/issues/325
- https://github.com/junegunn/fzf.vim/issues/300

Goes well with --height

- Move cursor to the top-left corner when starting a command in
  alternate screen
- Fix cursor position when returning to alternate screen when fzf is
  running in full screen mode

Close #823

Close #788

Close #821

Close #820

Close #818

Close #816

Close #805

Close #802