[CM] Snd 17.6

[bil at ccrma.Stanford.EDU]

Snd 17.6.

s7: (*s7* 'heap-size) is settable
     added s7_define_typed_function_star to s7.h
     changed to the new (c99?) int64_t style int types.
     added two optional args to c-pointer: type, info
       and added s7_is_c_pointer_of_type.
     libgtk_s7.c (in-progress)

clm: removed clm-default-frequency
      object->let support for generators

checked: sbcl 1.3.19|20, gtk 3.91.1

Thanks!: Mike Scholz, James Hearon