Unimplimented intrinsics

Unimplemented Intrinics. The following intrinsics have not been implemented: FWRITE, SFTINT, GETREG, BLKTRN, PEEK, POKE, POUT, PIN, INTRET, EXTJMP, EXTCAL, MALLOC, RELEAS, SHRINK, IRQ,

The SETWND intrinsic has only been partially implemented.