-The first instance of an OString can now intialize the string table rather than having to explicitly initialize it, which caused problems with static OStrings.

git-svn-id: http://odamex.net/svn/root/trunk@4276 b0bcef46-2027-0410-bd56-ab726e9a1d04
-Don't try to remove OStrings from the string table after the string table has been explicitly shutdown. This fixes crashes when statically allocated OString destructors are called.

git-svn-id: http://odamex.net/svn/root/trunk@4278 b0bcef46-2027-0410-bd56-ab726e9a1d04