add libresample to core libs in msvc build, rework GetLibs.vbs to be more sensible in it's structure, change jrtp4c build in msvc to build as part of mod_exosip instead of as a separate lib for build simplicity, squash numerous warnings in libiax2 and jrtp4c, delete FreeswitchPlusLibs.sln because we were not using it and not maintaining it.

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@250 d0543943-73ff-0310-b7d9-9358b9ac24b2