Addition of "pastel" set of colour maps

[MBravoS]

From the discussion in #1 has become clear that we need to replace cmocean's lighten tool with a new set of colour maps. These maps should have a smaller lightness dynamic range and chroma values to reproduce the effect of lighten when used on top of a white background (the most likely scenario).

[MBravoS]

I have added a first version on my development branch, with both jscm files (in a new folder) and viscm visualisations. What do you think @AstroRobin? I wasn't feeling particularly inspired about names, so they are all named as Xpastel (e.g., the blue pastel colour map is Bpastel), but I'm not sure if some variation of that or unique names would be the best approach.

[AstroRobin]

Most of the pastel colourmaps look quite nice and I'm encouraged enough to pursue adding these now. A feel of the colourmaps might need tweaking, for instance:

• Purple and Magenta could diverge from one another slightly more.
• Red could be made more red and avoid finishing in orange (if possible).
• Orange should be brought closer to the current red.
• Yellow has a significant tinge of green throughout. This colourmap will be very difficult to achieve given yellow saturates so quickly. But even moving it closer to the current orange might help.

Note, I haven't played will the colours paces for these, so these requests may be unfeasible.

[MBravoS]

I agree, looking at the colour maps several of them aren't the right hues. I had another go at the colour maps you mentioned, and I think they are much better now. I have also added them to the package in my branch, so feel free to install that version to test the new versions.

[AstroRobin]

I think you've solved on all of my qualms above in the latest version. However, I'm now not 100% convinced by SoftBlue, it's almost too far on the grey side for me. A quick run through LabelColourmaps.py gives the following:
('french blue', '#436bad', '#5873a2')
('slate blue', '#5b7c99', '#617ba7')
('faded blue', '#658cbb', '#6a83ac')
('faded blue', '#658cbb', '#748bb1')
('faded blue', '#658cbb', '#7e93b7')
('blue/grey', '#758da3', '#879bbd')
('bluey grey', '#89a0b0', '#91a4c3')
('cloudy blue', '#acc2d9', '#9badc9')
('cloudy blue', '#acc2d9', '#a5b5d0')
('light blue grey', '#b7c9e2', '#afbed6')
('light blue grey', '#b7c9e2', '#bac8dd')
('light blue grey', '#b7c9e2', '#c5d1e5')
('light blue grey', '#b7c9e2', '#d0dbed')
('light blue grey', '#b7c9e2', '#dbe5f4')
('pale grey', '#fdfdfe', '#e7effd')

I've added a slightly modified version SoftBlue* to devel_matias to give a sense of the change I would make to this colourmap. Feel free to keep, modify or even ignore. The LabelColourmaps.py output of SoftBlue* is:
('windows blue', '#3778bf', '#3277bd')
('cool blue', '#4984b8', '#407fbf')
('cool blue', '#4984b8', '#4c87c1')
('faded blue', '#658cbb', '#5790c4')
('faded blue', '#658cbb', '#6398c7')
('greyblue', '#77a1b5', '#6ea1cb')
('greyblue', '#77a1b5', '#79a9cf')
('light grey blue', '#9dbcd4', '#84b3d3')
('light grey blue', '#9dbcd4', '#8fbbd8')
('light grey blue', '#9dbcd4', '#9ac5dd')
('light grey blue', '#9dbcd4', '#a5cee2')
('light grey blue', '#9dbcd4', '#b0d8e9')
('pale sky blue', '#bdf6fe', '#bbe2ef')
('pale sky blue', '#bdf6fe', '#c7ecf5')
('very light blue', '#d5ffff', '#d2f6fc')

[AstroRobin]

Also, as an aside, I think the directory name containing all the Soft jscm files should be renamed from "pastel" --> "soft".

[MBravoS]

I like that one. I replaced mine with yours and the new version is now live with the new colour maps.