Check 0.12.0

This release of Check adds or improves support for a few Windows compilers as well as adding a new API for configuring the maximum error message size.

Changes:

• Fix out-of-tree builds with CMake.
  Issue #86

• Fix issue found with Clang regarding invalid suffix on a literal
  Issue #110

• Check now responds to a few errors in a more clear way when it cannot run tests.
  PR #122, #123

• Fix missing pid_t definition in check.h on Windows
  Issue #78

• The maximum message size of check assertions is now configurable.
  Issue #127

• Check support added for Visual Studios 2010, 2012, 2013, 2015, and 2017 both for x86/64 and ARM.
  PR #129, Issue #125

• Changed license of example CMake files to BSD (was previously LGPL).
  Issue #131

• Fix issue with floating point macros on MinGW
  Issue #101