Automatically stop most user-oriented hooks if the user becomes dead.

Automatically stop most user-oriented hooks if the user becomes dead.

src/hash.c (NickChange): Stop iterating if the user is killed by any hook.
  (AddChannelUser): Likewise.
src/nickserv.c (set_user_handle_info): Likewise.
src/proto-common.c (of_list, of_size, of_used, reg_oper_func,
  call_oper_funcs): Move from the proto-*.c files.  Make call_oper_funcs
    stop iterating if the user is killed by any hook.
src/proto-bahahmut.c (AddUser): Likewise.
  (of_list, of_size, of_used, reg_oper_func, call_oper_funcs): Move to
    proto-common.c
src/proto-p10.c: Likewise to proto-bahamut.c.