Fix YAML/TinyXML patches for GCC versions older than 4.2
* fixed getcwd error on OSX maverick
* fixed -undefined dynamic_lookup warning on OSX
* fixed multiple extern C warning in pyglue
* fixed visibility when using clang
FileFormatTruelight: Added write support for truelight luts (with unity shaper lut)
FileFormatTruelight: Updated whitespace to match the output of Truelight
It looks the LookNoOp was copy pasted from the FileNoOp and some names were not updated
Added support to specify multiple architectures with CMAKE_OSX_ARCHITECTURES.
Implemented USE_EXTERNAL_LCMS flag that was already in the main cmake file