Add definition for STR$ELEMENT.
Changed to also output the MAX symbol to the MACRO-32 output.
Rewritten ZK$MAP in BASIC so we can use the EDIT$ builtin to tidy up
the command line.
Changed to support ZK$MAP in BASIC, not Pascal.
Fix definition of zk$room_max and explicitly specify argument passing
mechanisms.
Fix up argument passing mechanisms for calling from BASIC.