...where multiple parallel calls to xmloff::token::ResetTokens or
xmloff::token::GetXMLToken can see dangling pOUString pointers.  There is no
point in releasing this (bounded) amount of memory referenced from global
aTokenList, anyway.

There is still a race when parallel calls to xmloff::token::GetXMLToken write to
a pOUString pointer in parallel, but that's more harmless, and maybe calls to
GetXMLToken are synchronized by Solar Mutex?  Calls to ResetTokens (e.g., via
URP remote release request -> ~ScXMLExport -> ~SvXMLExport) were definitely
/not/ synchronized via any mutex.

The xmloff::token::Inc/DecRescheduleCount functions are now pointless and have
been removed, too.

Change-Id: I85905d4de1f042ed5c9a37589f942910d8ef80fd