Issue 13019 - Different color for "Warning:"

https://issues.dlang.org/show_bug.cgi?id=13019

Choose colors: Warning -> light yellow, Deprecation -> light blue

The escape sequences are wrong. See http://superuser.com/questions/270214/how-can-i-change-the-colors-of-my-xterm-using-ansi-escape-sequences . Also, the format string is wrong - it has no conversion characters.