ft(interpreter): impl short jumps

src/operands.rs

@@ -95,6 +95,15 @@ impl ImmediateOperand {
     }
 }
 
+impl Into<usize> for ImmediateOperand {
+    fn into(self) -> usize {
+        match self {
+            ImmediateOperand::Byte(b) => b as usize,
+            ImmediateOperand::Word(w) => w as usize,
+        }
+    }
+}
+
 impl Add for ImmediateOperand {
     type Output = Self;