Set Windows console mode to enable support for ansi escape codes
Windows console now supports supports ANSI escape codes, but we need to enable it using SetConsoleMode with ENABLE_VIRTUAL_TERMINAL_PROCESSING flag.
Syntax hightlighting now works fine on Windows:
Reviewers: JDevlieghere, teemperor, zturner
Reviewed By: zturner
Subscribers: abidh, lldb-commits
Differential Revision: https://reviews.llvm.org/D51615