Add hex and RGB(A) support to all map color attributes

[patrikjuvonen]

Is your feature request related to a problem? Please describe.
It seems various color formats like hex or RGB(A) aren't supported for many element types like radararea and blip but throw an error instead.

This is a breaking change. For example the race gamemode depends on this old behavior as described in #1393

Describe the solution you'd like
Make color format support consistent across element types.

Describe alternatives you've considered
Use of a third-party script to convert unsupported color values in map files to a supported format.

Additional context

• Past attempt to fix: Fix #1258: Add mixed hex and RGB(A) parsing to XMLColorToInt #1261

[qaisjp]

Are legacy vehicle colors supported?

[qaisjp]

and are you 100% that allowing different types of colors in a single attribute is a good idea?

[patrikjuvonen]

By legacy colors you probably mean the palette colors. Yes, they are still supported same as before. This is also tested in the provided map file above.

As for mixed values, I think it is trivial, but to be honest I don't see any issues with having it either.

This is actually an "unintended" side-effect of the simplified C++ code to be able to read colors despite odd types mixed together. I didn't want to limit it to a single type. But I think it is not a bad side-effect as it doesn't break anything and is logical. I think it could be kept as undocumented behavior, as it is not good practice for mappers to do that.