Since the version 0.7.0, fzf internally used Curses.getch() call to take user
input, which allowed it to support mouse input as well. However it has turned
out that Curses.getch() has introduced glitches that cannot be easily handled
(e.g. Try resize the terminal). So I finally decided that it's not worth the
trouble and drop the mouse support.

Use `fc` instead of `history` to avoid `oh-my-zsh` alias

Feed all zsh history into fzf (not only most recent)

It turned out that Curses.can_change_color? returns false when $TERM is
set to screen-256color, which is perfectly capable of rendering 256
colors.

This commit adds --filter option so that fzf can be used as a simple unix
filter instead of being an interactive fuzzy finder.

To reproduce: `sleep 2; fzf` and press arrow keys

Add mouse support