add fancy `..._set_revision` macro
e.g.
superbuild_set_revision(ParaView
SELECT v5.2
URL "http://www.paraview.org/files/data/ParaViewTutorialData.tar.gz"
URL_MD5 ff7ceab8cfc674b227c0bba392d1ed3c
SELECT v5.1.2
URL ...
SELECT git
...
SELECT source
SOURCE_DIR "set your path here")