Merge master into the Windows port

Three of the four collisions were the same one: master moved the directory
rule into paths.py while this branch was adding a Windows case to the copy in
config.py and the second copy in ggml.py. The case moves to paths.py with the
rest of it, and the directories test moves to tests/test_paths.py where master
put its neighbours.

The fourth is MeetingRecorder, which now starts a process per capture device.
Windows keeps its two lines there: no console window for either process, and
a stop that terminates rather than sending a signal the platform does not have.

tests/test_ggml.py

@@ -236,7 +236,7 @@ class InstallProgram(Local):
         with fake_urlopen(listing):
             with self.assertRaises(ggml.LocalError) as caught:
                 ggml.install_program(ggml.WHISPER)
-        self.assertIn("brew install whisper-cpp", str(caught.exception))
+        self.assertIn("Build whisper-server yourself", str(caught.exception))
 
     def test_a_mac_uses_the_native_llama_archive_instead_of_ubuntu(self):
         self.patch_attr(sys, "platform", "darwin")