drop any default required version for EUMM
AutoVersion: lazy loading of DateTime

The AutoVersion plugin now loads DateTime only when needed. This will
reduce the amount of code compiled during `dzil listdeps`.

DateTime 0.44 is added explicitely in dist.ini.
TODO: AutoVersion should declare DateTime 0.44 as a 'develop' prereq.
NextRelease: lazy load DateTime
changelog entry for DateTime lazy load
test all WriteMakefile arguments
MIN_PERL_VERSION is harmless; leave it

This bit of code was added in commit 5c6a1202 but there doesn't seem to be any
need for it there.  We can still add a 'use' line, while keeping this data --
which also is added to MYMETA.*.
also get the minimum perl requirement from configure and test prereqs
also fold configure-requires prereqs into %FallbackPrereqs