Implement BASE-CHAR and EXTENDED-CHAR using DEFTYPE.
Implement BASE-CHAR and EXTENDED-CHAR using DEFTYPE.

They're simple, no need to special-case them.

rvedam/Mezzano,froggey/Mezzano,varjagg/Mezzano,varjagg/Mezzano,AugustusHuang/Mezzano,AugustusHuang/Mezzano,froggey/Mezzano,rvedam/Mezzano