fix(interpreter): impl fetch and decode

I parsed all instructions before executing, but this is not how
intel works.
We need to decode the instructions, pointed to by IP, on the fly.

src/main.rs

@@ -69,15 +69,8 @@ fn main() {
             }
         }
         Command::Interpret => {
-            let mut disasm = Disassembler::new(&args);
-            let instructions = disasm.disassemble(args.dump);
-            match instructions {
-                Ok(instrs) => {
-                    let mut interpreter = Interpreter::new(instrs, disasm.aout.data);
-                    interpreter.interpret().unwrap();
-                }
-                _ => {}
-            }
+            let mut interpreter = Interpreter::new(&args);
+            interpreter.interpret().unwrap();
         }
     }
 }