Basic Windows NSIS installer

cmake/platforms/windows.cmake

@@ -42,3 +42,7 @@ set(CLIENT_EXECUTABLE_OPTIONS WIN32)
 # CMAKE_EXECUTABLE_SUFFIX will be empty anyway, or we want
 # HOST_EXECUTABLE_SUFFIX to be empty for other reasons
 set(HOST_EXECUTABLE_SUFFIX ${CMAKE_EXECUTABLE_SUFFIX})
+
+set(CPACK_GENERATOR NSIS)
+set(CPACK_NSIS_MUI_ICON ${WINDOWS_ICON_PATH})
+set(CPACK_NSIS_EXECUTABLES_DIRECTORY .)