[Waging war against the Yang di-Pertuan Agong — Seizure of armory to set up Islamic state contrary to Federal Constitution — Ingredients to be proved — Whether amounted to waging war against the government — Failure to spell out common intention in charge, whether offence under s 121 differentiated culpability between principal and accessories — Accused said to be laboring under mistake of fact when committing offence, whether mens rea proved — Balance of public and private interest — Mitigation — Penal Code ss 121 & 122]