Cpack.cmake: Document CPACK_PACKAGE_VERSION_* defaults
I spent a few minutes being confused as to why my version 0.1.1 package worked but my version 0.1.2 package did not. I have documented the CPACK_PACKAGE_VERSION = 0.1.1 default.
However I wonder whether another default might be more sensible? Something based on "PROJECT_VERSION_MAJOR", "PROJECT_VERSION_MINOR" & "PROJECT_VERSION_PATCH"?
I have also added the default vendor and Windows system name things.
Edited by Harry Mallon