Color picker replace preset colors with chosen colors once picked

[brauliodiez]

Right now the preset colors are shown by default

It would be great if:

• The preset transparent color is always visible and in the same position.
• The rest of colors are being replaced as soon as the user picks color (first color picked, replace the index[1] of presets and so on.
• We could use a circular approach, once we reach length index -1 start with position one.

We could add it to the Canvas context, even serialize it once we save the doc (this could be done in a separate stage).

[jsanzdev]

I created a first draft of this feature. Now we can save custom colors. Currently there is no limit on how many palettes we can save, however the color picker doesn't have a shared state so custom colors will not be shared between all the color pickers.