Add assignment operator to ansi color sink. Adjust default colors.
Add assignment operator to ansi color sink. Adjust default colors.

icylord/spdlog,icylord/spdlog,hunter-packages/spdlog,GreatFruitOmsk/spdlog,COMBINE-lab/spdlog,COMBINE-lab/spdlog,godbyk/spdlog,GreatFruitOmsk/spdlog,godbyk/spdlog,hunter-packages/spdlog,hunter-packages/spdlog,mihadyuk/spdlog,icylord/spdlog,mihadyuk/spdlog,godbyk/spdlog,mihadyuk/spdlog,COMBINE-lab/spdlog