Allow to change colour attributes via the configuration (change the theme) about purebred HOT 3 OPEN

Version 0.29 of brick added theme support.

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I noticed this issue today, but I don't think it's an easy fix. The issue is ambiguous and I suppose I personally would want clarification of how we would want to support themes. Brick allows to define themes by using an ini file, yet we configure Purebred entirely through Haskell code. So question I would have with this is:

• Would we support bricks theme support via ini file? (Personally not a fan, since it feels awkward from a documentation point of view)
• Should we support adjusting colours via our config? (Seems the most "natural" way, since everything is configured this way too)
• Should we support configuring it via plug-ins? (Not sure how this would look like, but perhaps a won't give us much)

I guess until we have a better understanding I remove the easy fix labels.

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@romanofski, agree we should look for how to do it via our config. If we can do that, then plugin support is a natural consequence (it is trivial for a plugin to modify the config at application startup).

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