This was broken by several small unicode-incompatible code fragments.
This commit also removes the input limit for the player name and the savegame description. With multibyte encoding, limiting them to a fixed length did not work right.
Currently these will just overflow the fields if the text becomes too long, this needs some additional work.
Without this the class cannot be properly subclassed.
# Conflicts:
# wadsrc/static/zscript/ui/menu/optionmenuitems.zs
# Conflicts:
# wadsrc/static/zscript/ui/menu/optionmenuitems.zs