cmake rework, cleanup a lot of redundant sections, separate library and binary install location, unify osx and win handling of the data directory (tested on win, lin and mac)
if(WIN32 AND NOT UNIX)
file(GLOB DLLs *.dll)
file(GLOB ICOs *.ico)
install(FILES
${DLLs}
${ICOs}
DESTINATION ${target_library_install_dir})
endif(WIN32 AND NOT UNIX)