refactor datum->random-state / random-state->datum

* libguile/random.c (scm_t_i_rstate): Move here from random.h, along
  with prototypes for functions
  (scm_i_uniform32, scm_i_init_rstate, scm_i_copy_rstate): Change to
  take a stock scm_t_rstate as an arg, and cast it. This way we don't
  cast the pointers below.
  (scm_i_rstate_from_datum, scm_i_rstate_from_datum): Same and rename
  from scm_i_init_rstate_scm / scm_i_expose_rstate.
  (scm_c_rstate_from_datum): Rename from scm_c_make_rstate_scm.
  (scm_datum_to_random_state, scm_random_state_to_datum): Rename from
  scm_external_to_random_state and scm_random_state_to_external.
  (scm_init_random): Remove casts.

* libguile/random.h (scm_t_rng): Rename init_rstate_scm, expose_rstate
  vmethods to from_datum, to_datum. Remove internal definitions. Rename
  to scm_c_rstate_from_datum, and provide scm_random_state_to_datum and
  scm_datum_to_random_state.

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