Allow more elements to have a color override in a Style

[Morxemplum]

I think a nice addition that we can have to styles is the ability to override elements that usually would refer to the "main" color with new color attributes.

Here's a few things that can be overridden (this is the first issue I've raised with a checklist):

• Player Color
• Text Color
• Swap Color
• Void Color

[Zly-u]

Would add:

• Individual background panel colours by ID.

sounds like a cool feature to me idk.
If it's for Lua ofc

[Morxemplum]

That is an entire issue on it's own, as it is pertaining to Lua. This issue focuses on the style JSONs themselves.

[Morxemplum]

Updated the issue by adding one more thing: the underlying background (or void, whatever you'd like to call it). Maybe that could be customizable. It may not serve a use 90% of the time, but it would give the Alpha attribute a purpose. I just consider the alpha attribute to be a glorified darkening attribute.

Since 2.0.3, player color and text color overrides are now possible because of #261. Swap color will be interesting. Both swap color and void color are niche, but again, we considered a lot of things in 1.92 niche but turned out to be fairly useful features later on. I'll have to see what I can do.