Support ItsyBitsy M4 Express as an effective clone of the Feather M4 Express with less pins. Because that's what it is.

kmk/entrypoints/handwire/itsybitsy_m4_express.py

@@ -0,0 +1,33 @@
+import sys
+from logging import WARNING
+
+from kmk.circuitpython.hid import HIDHelper
+from kmk.circuitpython.matrix import MatrixScanner
+from kmk.common.consts import UnicodeModes
+from kmk.firmware import Firmware
+
+
+def main():
+    from kmk_keyboard_user import cols, diode_orientation, keymap, rows
+
+    try:
+        from kmk_keyboard_user import unicode_mode
+    except Exception:
+        unicode_mode = UnicodeModes.NOOP
+
+    try:
+        firmware = Firmware(
+            keymap=keymap,
+            row_pins=rows,
+            col_pins=cols,
+            diode_orientation=diode_orientation,
+            unicode_mode=unicode_mode,
+            log_level=WARNING,
+            matrix_scanner=MatrixScanner,
+            hid=HIDHelper,
+        )
+
+        firmware.go()
+    except Exception as e:
+        sys.print_exception(e)
+        sys.exit(1)