-Add OStringToUpper and OStringToLower which translates all of the characters in an OString to uppercase or lowercase respectively.

git-svn-id: http://odamex.net/svn/root/trunk@4505 b0bcef46-2027-0410-bd56-ab726e9a1d04
-Add an optional maximum length parameter to StdStringToUpper and StdStringToLower (defaults to std::string::npos).

git-svn-id: http://odamex.net/svn/root/trunk@4508 b0bcef46-2027-0410-bd56-ab726e9a1d04