Colors about tueplots HOT 7 CLOSED

Actually it would be nice to just have them as static np.arrays, not as functions, too. Saves a lot of typing.

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I think it would be great if we could also define a default color palette.

We could also use the default of matplotlib or seaborn, but I would prefer a custom one. A custom color palette would make our plots look much more recognizable. I guess @philipphennig you would have a preference for main, second, third, ... colors?

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I mean, the obvious choice is the Uni-TUE color palette. It works well for plots with up to three lines. But I realise that it may not be everyone's cup of tea. We could keep the default color palette as the default and offer the unitue palette as a replacement.

For what it's worth, I'm not a fan of seaborn. It's too heavy-handed for my taste.

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thanks for the great inputs! :)

The original reasoning behind using functions was that I dont really like a bunch of constants lying around the source. But I guess constants are more practical anyway -- let's see how far we get with that!
The original reasoning behind using tuples was that this way, the source is dependency-free. However, if we depend on matplotlib anyway (which has a numpy dependency, too), there is no real reason to avoid numpy arrays. So yes, we can change them into arrays.

Regarding the color palette: I think it is a great idea to add color palettes. How about not adding a default color palette, but a range of palettes so a user can choose freely without us imposing our tastes? I have some color cycles lying around (tue, probnum, tufte, etc.) which I can turn into rcParams inputs.

I suppose then it would make sense to branch out the color module:
color/
rgb/ # for RGB constants
cycles/ # for color cycles

from where on one can expand.

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See #5.

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Ok, great!

I think static constants are fine if they are within the namespace of the package. Numpy has np.pi, so it can't be that bad :)

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#13 introduces color constants.

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