Feature request: Expand colormap options

[norlandrhagen]

Super neat project!

I was wondering if we could expand what kinds of colormaps we can pass into STYLES (stylename/palettename).

On a quick prototype, passing in a cmocean colormap from palettable works with in get_map.py.

import palettable
colormap = palettable.cmocean.sequential.Ice_20.get_mpl_colormap()

shaded = tf.shade(
    mesh,
    cmap=colormap #self.palettename
    how="linear",
    span=span,
)

[mpiannucci]

You can pass any default matplotlib colormap name into raster/{colormap}! We are thinking of how to do custom but for now this is a bit of options if it wasn't clear

[mpiannucci]

You can also deploy this custom with the render function overridden to further customize