Adjust Color::ALICE_BLUE

[CleanCut]

Objective

• The Color::ALICE_BLUE constant is currently an off-white color, which is confusing when there is an actual Alice Blue shade that is well-known to be light blue.

Solution

• Change the color to match the shade defined in the Wikipedia article. I used just enough precision in the floating point values so that the math would result in the matching u8 value in the wikipedia article if multiplied by 255.

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Changelog

This section is optional. If this was a trivial fix, or has no externally-visible impact, you can delete this section.

• The Color::ALICE_BLUE constant is now the correct shade of blue, rather than an off-white shade.

[github-actions]

It looks like your PR is a breaking change, but you didn't provide a migration guide.

Could you add some context on what users should update when this change get released in a new version of Bevy?
It will be used to help writing the migration guide for the version. Putting it after a ## Migration Guide will help it get automatically picked up by our tooling.

[IceSentry]

The current color is based on https://www.w3schools.com/colors/color_tryit.asp?color=AliceBlue

The wikipedia article also links this https://www.w3.org/TR/css-color-3/#svg-color which contradicts the value present in the wikipedia page

[MrGVSV]

The wikipedia article also links this https://www.w3.org/TR/css-color-3/#svg-color which contradicts the value present in the wikipedia page

I think the Wikipedia does refer to the same color. It separates Alice Blue into two colors. I’m pretty sure the one we're using currently is based on the web version (which is what I’d expect).

[IceSentry]

I think the Wikipedia does refer to the same color

Oh, yeah I just looked at the first one and saw it was different. Didn't notice it listed a second one 😅

[nicopap]

So do we prefer the historical AliceBlue or the X11/W3C AliceBlue? The PR description doesn't motivate the change.

[mockersf]

I would prefer to keep to the web colors. The color from this PR is US centric and not used anywhere else

[CleanCut]

Huh, okay. I can't actually tell the difference between pure white and the alice blue white on my screen, but I had no idea the whitish color was some web color thing.

[cart]

Quick @alice-i-cecile just give us a random hex code and we'll use that as ALICE_BLUE.

[alice-i-cecile]

#54b6e3. Now it's canon!