rutil: Data: use of fixed-size integer types for methods that work with fixed buffer sizes

git-svn-id: https://svn.resiprocate.org/rep/resiprocate/main@10433 ddefafc4-47db-0310-ae44-fa13212b10f2
rutil: compat.hxx: add snprintf for Visual C

git-svn-id: https://svn.resiprocate.org/rep/resiprocate/main@10434 ddefafc4-47db-0310-ae44-fa13212b10f2