feat(ui5-color-palette): initial implementation

[tsanislavgatev]

FIXES: #2615

[vladitasev]

Looks good, overall much simplified :)

It's getting close to being ready

[vladitasev]

@fifoosid Consider using this for the color picker?

[ilhan007]

I think we should import ColorPaletteEntry always (with the ColorPalette).

[vladitasev]

Looks great! I like how this is shaping up. Logic is nicely separated and files are small and easy to read and understand. I'd like you to clear up 2 things:

• IMO better names would be: ColorPaletteEntry => PaletteColor and ui5-color-palette-entry => ui5-palette-color. The logic is that we have a Color Palette, composed of Colors. We can call them Palette Colors because that's what they are - colors of the Color Palette. Let's discuss this via email. I'll follow up on it.
• Please look into the index logic. Currently, as far as I can see, index is only used for displaying ACC texts and labels. Yet it is bound set inside both .hbs files and additionally in onBeforeRendering. IMO just set the index property for the colors inside onBeforeRendering and not in any of the templates. Then just read it in the color class to build the acc stuff. This should be enough.

I think this change is nearly ready overall. We could merge it today :)

[ghristanov]

Sufficient ARIA support.

[vladitasev]

I just tested on IE11 and it does not work at all. Clicking colors has no effect whatsoever. Please check if the problem stems from the fact that events have been bound to the slot. There are minor visual degradations, but the 2 main bugs are:

• not all colors are displayed
• clicking a color does not fire the event