OLC medit changes

Added race selection in OLC medit.
Added subrace selection in OLC medit.
Added class selection in OLC medit.
Race, subrace and class mob info will now be saved and loaded correctly.
Modified parsing of race code from mob files to be case sensitive to have all races "usable".
Added race, subrace and class info to the ASCII part of mobfile (for future use??)
Imported utility string functions from RavenMUD.