Highlighting still assumes a dark background

[bergus]

Like #7737.

I'm using Git's MINGW64 with a white background, and the error message is not visible at all. Using the verbose flag didn't show any further information but that rustc failed with exit code 101. It wasn't until I tried to copy the terminal output into a bug report that I realised there actually was some text.

   Compiling cortex-m-demo v0.1.0 (file:///C:/Users/…/cortex-m-quickstart)
error: language item required, but not found: `panic_fmt`

error: aborting due to previous error

error: Could not compile `cortex-m-demo`.

To learn more, run the command again with --verbose.

[estebank]

We should be able to query the current background color using COLOR and adapt the highlighted color accordingly.

[mati865]

@rustbot modify labels: -O-windows-gnu +O-windows
Affects all terminals running on Windows (no matter the toolchain).

[kno10]

This is not just on Windows.
Same problem on Linux if you don't use dark background (research says, black text on white is better: https://ux.stackexchange.com/a/53268 ).
With a white terminal, the current color scheme is really bad:

can you read any of the yellow text? I can't.

Please add support for white background.