add a config settings and flag for colours

Colours can be enabled in two ways:

- Add Color to pacman.conf. This enables colours automatically.
- Use --color=WHEN where WHEN is none/auto/always.

WHEN as 'never' disables colours (overrides config file), as 'auto'
enables colours when stdout is a tty, and 'always' enables colours no
matter what.

Signed-off-by: Simon Gomizelj <simongmzlj@gmail.com>
Signed-off-by: Allan McRae <allan@archlinux.org>

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