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Conan recipe for handling the XMP SDK

The CMake code of the XMP SDK is far from being ideal and the README provided in their instructions ask to the users to prepare a bunch on things before being able to configure and compile the code.

I tried to simplify their CMake as much as possible to be able to compile the SDK for the 3 main platforms: Linux, Mac OSX and Windows. However, I've found some limitations.

They are relying on the specification of a OSX SDK version to make things work, but it seems that the code is not adapted to work with recent versions of the OSX SDK. I tried with several combinations of xcode and the macosx version and I just left in the travis files the one that works.