Remove AnsiColors

[wilkinsona]

It was added as part of image banner support and image banner support was removed in 3.0.0-M2. AnsiColors should have been removed at that time. This issue will correct that oversight.

[meiMingle]

No, I disagree, I think maybe AnsiColors deserves to be kept. It is useful for generating Ascii Art style banners, for example I can use it to generate colored QR codes like the one below. If AnsiColors is removed, it is a big hassle to manually handle the conversion from Color to AnsiColor, AnsiBackground, Ansi8bitColor.

[meiMingle]

Although AnsiColors was originally used to support image banners, it should not only be seen as a part of image banners, it plays an important role in processing text banners into colored Ascii Art banners, as in the picture above.

[wilkinsona]

Unfortunately, as we no longer have any need for it in Spring Boot I don't think we can justify the ongoing cost of maintaining and enhancing it. Given Spring Boot's permissive Apache v2 licence, you are free to copy the source code into your own application and maintain it there.