use perl native cp rm mv not to depend on cygwin

[halueda]

Currently auto-sync is depend on Cygwin because it needs following commands:
/bin/cp
/bin/mv
/bin/rm

To replace them with perl native function/package, more applicable to the environment without cygwin.
E.g., Windows + ActivePerl environment.

[halueda]

auto-sync also depend on diff and sed, to make log string to notice config file change.