creat shutdown.h i system_utils.h

fix: arreglants uns includes per a windows

CMakeLists.txt

@@ -81,7 +81,9 @@ set(APP_SOURCES
     source/input_types.cpp
     source/mouse.cpp
     source/options.cpp
+    source/shutdown.cpp
     source/stage.cpp
+    source/system_utils.cpp
     source/utils.cpp
 )