Introduce project hierarchy, OSX universal lib support & uninstall script

	* json_spirit source and headers are now in the src dir

	* new dir 'cmake' for cmake build configuration scripts, such as the
newly introduced uninstall script cmake_uninstall.cmake.in

	* General re-organization / clean up of our build script

	* Remove TTCARDS_JSON_SPIRIT_COMPILE variable; we might later
replace this with something like EXTLIBS_COMPILE or similar