resip/stack: remove generated code from DateCategory.cxx into DayOfWeek.cxx and Month.cxx
resip/stack/gen: add copies of DayOfWeek.cxx and Month.cxx for convenience of Windows users
resip/stack: complete changes to DateCategory.cxx for DayOfWeek and Month
resip/stack: add new DayOfWeek.cxx and Month.cxx to Visual Studio builds
Merge branch 'master' into gperf-fixes
resip/stack: ensure dayofweek and month hash functions prefixed
resip/stack/gen: update copies of DayOfWeek.cxx and Month.cxx for convenience of Windows users
resip/stack: DayOfWeek, Month: wrap gperf generated function definitions in namespace
resip/stack: DayOfWeek, Month: use gperf C++ mode
resip/stack: DayOfWeek, Month: rename generated files, update latest convenience versions under resip/stack/gen