Automatically detect ANSI color support in new Windows conhost.

[Robpol86]

http://www.nivot.org/blog/post/2016/02/04/Windows-10-TH2-%28v1511%29-Console-Host-Enhancements
https://msdn.microsoft.com/en-us/library/ms683167.aspx
https://msdn.microsoft.com/en-us/library/mt638032.aspx

Looks like (compared to archive.org) ENABLE_VIRTUAL_TERMINAL_PROCESSING (0x0004) was recently added to GetConsoleMode (and set). Perhaps I can use this to determine if stdout/stderr streams should not be replaced on Windows, instead of having users of colorclass figure it out themselves?

[Robpol86]

Fixed in 4d46766