Console colors are hard to read on default configuration

[Gaibhne]

I'm not sure what BuildKit is generally developed on, but I would confidently say that the default background for shell/console windows is black background. The default dark blue color choice is practically unreadable on black backgrounds and seems like a strange choice for a command line tool.

I know I can disable colours completely with the plain output mode, but that cuts away a lot more things. Please change the colors to a more reasonable default or let us at least configure them somehow.

[electrofelix]

For anyone investigating this, please switch your console palette preference from tango/solarized to Linux Console to see how poor the contrast is when using what can often be the default colour scheme.

[andilem]

Please fix this... Now that buildkit is the default build tool, builds without --progress=plain are not readable anymore in a windows cmd.

[tonistiigi]

#2368 updates the colors for windows and as this seems windows specific I'm going to close for now.