Interrupt system implemented, some new programs.

Programs/testPrograms/interruptFlagTest.asm

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+; Tests SIF and CIF, the Interrupt Flag.
+;
+; Nothing reads the Interrupt Flag yet, so what this proves is that the two
+; instructions decode, execute, and leave everything else exactly as they found
+; it. The Carry Flag is the part worth checking, because it lives in the same
+; Status register and a careless mask would take it out.
+;
+; Correct output is:
+;   OKC
+
+#Program
+
+start:
+  ; Load two registers, run the new instructions across them, and prove that
+  ; nothing moved.
+  INIA 0d79         ; 'O'
+  INIB 0d75         ; 'K'
+  SIF
+  CIF
+  SIF
+  OUTA 0x00         ; Still 'O'.
+  OUTB 0x00         ; Still 'K'.
+
+  ; Now set the Carry Flag, and work the Interrupt Flag around it.
+  CCF
+  INIA 0xFF
+  INIB 0x01
+  ADD               ; Q = 0, and the Carry Flag is set.
+  SIF
+  CIF
+  BRC carryHeld
+
+  ; Falling through here means one flag trampled the other.
+  INIA 0d88         ; 'X'
+  OUTA 0x00
+  INIA 0x0A
+  OUTA 0x00
+  HALT
+
+carryHeld:
+  INIA 0d67         ; 'C'
+  OUTA 0x00
+  INIA 0x0A
+  OUTA 0x00
+  HALT