And simplify the argument escaping code. Fix#3764.
This may breaks some existing use cases, but the mode causes too much
trouble when escaping arguments and it makes some things not possible.
# Now you can pass special characters to rg process without any escaping problems: &|<>()@^%!
fzf --ansi --disabled --bind "change:reload:rg --column --line-number --no-heading --color=always --smart-case -- {q}"
# No sudden expansion of the arguments on '!'
fzf --disabled --preview "echo {q} {n} {}" --query "&|<>()@^%!" --prompt "&|<>()@^%!"