GNUtoMS: Add support for VS 2013 (#14936)

Add to the Platform/Windows-GNU module list of VS registry entries those
for VS 2013.  Also add the name "vcvars64.bat" used by VS 10 and above
for 64-bit tools.
Merge branch 'GNUtoMS-vs-12' into release
cmake: Tolerate missing HELPSTRING on compiler change

Teach cmake::HandleDeleteCacheVariables to tolerate a missing HELPSTRING
(NULL pointer) when saving cache entries.  In the absence of other bugs
this should not be possible, but avoid the crash just in case.
cmCacheManager: Avoid cache entry self-assignment

Since commit bef93dc5 (Couple of changes: cache variables now have a map
of properties, 2002-09-11) the cmCacheManager::AddCacheDefinition method
accesses its map entry by reference.  However, the commit left the
original entry assignment at the end of the method.  With Apple Clang
5.1 and libc++ this self-assignment destroys the cache entry property
map.

Drop the self assignment.  Also drop the condition around the call to
UnwatchUnusedCli since it was a self-comparison that must always have
been true.
Merge branch 'fix-cache-self-assignment' into release