Updated Color Palettes & Generator

[chasturansky]

Is your feature request related to a problem? Please describe.
Currently there are so many colors and they are hardly used in applications. These also do not apply when it's themed.

Describe the solution you'd like
There should be simplified colors palettes. primary, secondary, status, grey

These palettes should also be themeable. Or some sort of generator to make picking and distributing easier.

Describe alternatives you've considered
Using Materials color palettes. This wouldn't integrate into Denali though.