Remove a ton of leftover MicroPython code and abstractions, including all of kmk.pins

setup.cfg

@@ -1,5 +1,5 @@
 [flake8]
-exclude = .git,__pycache__,vendor,.venv,build,dist,.compiled
+exclude = .git,__pycache__,vendor,.venv,build,dist,.compiled,mnt
 # match black expectations
 max_line_length = 88
 
@@ -47,6 +47,7 @@ known_standard_library =
     ubluepy,
     uio,
     uos,
+    usb_hid,
 
 # black compat
 multi_line_output=3