v1.6.0

Cmake/ projects:

• Moved CMakeLists.txt to root, made it friendlier for CLion and generating XCode and VS projects, and removed the manually maintained XCode and VS projects.

Features/ Changes:

• Approx now supports >= and <=
• Can now use \ to escape chars in test names on command line
• Standardize C++11 feature toggles

Fixes:

• Blue shell colour
• Missing argument to CATCH_CHECK_THROWS
• Don't encode extended ASCII in XML
• use std::shuffle on more compilers (fixes deprecation warning/error)
• Use __COUNTER__ more consistently (where available)

Other:

• Tweaks and changes to scripts - particularly for Approval test - to make them more portable