tooltip over color should show the color name

[Esshahn]

e.g.

light gray, dark gray, white etc

[Esshahn]

Would require a rewrite of the palette to switch from canvas to div based

[Esshahn]

rewrite done, now no canvas is used anymore, but divs instead. However, showing color information like "dark gray" would require that information to be included for all colors for all palettes in the config. I don't currently see enough value for that. Instead, the RGB values are now displayed