Edited CMakeLists.txt
Edited CMakeLists.txt

Added an api version and a build version
 - api version is the corresponding version of QtTiled
 - build version is the api version appended with the release increment
Always build the static library, if BUILD_SHARED_LIBS is set, it will also build the shared library (.so/.dll)
Installs the DLL in the runtime directory (INSTALL_PREFIX/bin) on Windows

baylej/tmx,howprice/tmx