relix:  Fix filename in header comment
Genie -> relix:  Move/rename unimplemented()
Genie -> gear:  Move is_binary_data() function
[NEW] mac-types:  Reimplement Mac OS struct types

Starting with FSSpec, mac-types defines its own versions of Mac OS types
which are layout compatible (and can be safely coerced) but don't entail
the overhead of including Mac OS headers.
mac-sys-utils:  Add get_process_file()
Genie:  GetAppFile() -> mac::sys::get_process_file()
Merge branch 'get_process_file'