build: versioning

versioning via git tags, commits after tags are displayed in the versionnumber

cmake/version_setup.cmake

@@ -0,0 +1,7 @@
+# # build type needs to be in added as definition because of visual studio
+message(STATUS "setting up the buildtype for versioning")
+if(MSVC)
+    add_definitions(-DBUILD_TYPE="${ConfigurationName}")
+else(MSVC)
+     add_definitions(-DBUILD_TYPE="${CMAKE_BUILD_TYPE}")
+endif(MSVC)