For example, if the community distributes Cura in a different way, they
can set CURA_BUILDTYPE via 'cmake -DCURA_BUILDTYPE=' and whenever Cura
is launched " (PPA)" will be appended. Of course, this could be done by
appending " (PPA)" to CURA_VERSION, but in case of my Ubuntu/Debian
packaging it will only need one modification in debian/changelog to
change the version. During build (debian/rules) this version will be
read from debian/changelog.
Changing the version number across different files, is a waste of time.
Finally, we can use that field in the future to indicate debug or other
other special builds.