[PATCH] core.loggingmanager: Add a fallback for color on legacy Windows console host

[vkvo...@vivaldi.net]

Legacy console host (used in Windows 10 1511 on earlier) does not support ANSI
sequences, the only way to get 'somewhat proper' color output is to switch
console background and text colors.

[Vitaly Orekhov]

PSA: the patch above contains a reversed condition check I forgot to revert during debugging. Don't use one, the proper one is coming soon.

[Vitaly Orekhov]

False positive alarm here. This patch is valid, the previous alert was about changeset to util.startup, which I luckily haven't sent that day. Sorry for inconvenience.