Updated MinGW cross-compilation documentation.
Removed OS name from MinGW files.
Added toolchain files for MinGW-w64 on Cygwin.
CMake toolchain file fixes.
Added CMake toolchain file for Debian MinGW-w64.
Added initial Linux MinGW-w64 support.
Updated toolchain file README.
Gave CMake toolchain file clearer name.
Replaced hand rolled X extension detection with built-in version.
Moved additional CMake files into the CMake directory.
Initial import of 2.7 Lite.