changed handling of forbidden world writes - they are now only a

changed handling of forbidden world writes - they are now only a
warning, and still perform the actual write, additionally the check has
been moved from OP_ADDRESS to OP_STOREP_* and now prints what field is
being written
changed the nature of pointer fields (which are only written by
OP_ADDRESS and read by OP_STOREP_*) to use an index (like field offsets)
instead of a byte offset, this made it a little easier to print the
field offset on world write warnings

git-svn-id: svn://svn.icculus.org/twilight/trunk/darkplaces@9339 d7cf8633-e32d-0410-b094-e92efae38249