I/O Library for Lua

I/O support has been done for a while, and the code recently got a cleanup. No bugs have been reported as of late.

src/blua/Makefile.cfg

@@ -18,6 +18,7 @@ OBJS:=$(OBJS) \
$(OBJDIR)/ldo.o \
$(OBJDIR)/lfunc.o \
$(OBJDIR)/linit.o \
+	$(OBJDIR)/liolib.o \
$(OBJDIR)/llex.o \
$(OBJDIR)/lmem.o \
$(OBJDIR)/lobject.o \