(a) What number of police officers faced disciplinary charges after the (i) injury and/or (ii) death of civilians as a result of action taken by the specified officers while policing public protests (aa) in each of the past three financial years and (bb) since 1 April 2017, (b) what are the charges in each case, (c) on what date was the action instituted and (d) what was the outcome of the proceedings?