Finish handling mappingName in shared memory utilities #50
Description
The UtilMappedViewWriteBegin() and UtilMappedViewReadBegin() functions have incomplete (and undefined) code that attempts to use the mappingName in the CreateFileMapping() call. This should be implemented properly so that permissions problems can be surfaced more easily.
Originally posted by @OrestZborowski-SIG in #45 (comment)