Ruby

[ruby/reline] Use color name instead of code (integer) in dialog color APIs

As pointed out in the
comment,
the code is actually a control sequence and not only for colors.

To make the dialog color APIs safer to use, we should restrict its
usages and extract away the bg/fg concept from the input.

So in this commit, I made these changes:

1. The dialog_*_bg/fg_color APIs only takes and returns color names (symbol):

• :black
• :red
• :green
• :yellow
• :blue
• :magenta
• :cyan
• :white

2. Add additional dialog_*_bg/fg_color_sequence APIs to access the raw code.

https://github.com/ruby/reline/commit/b32a977766