Able to build a VERY basic KMK image for Feather M4 Express, flashable over UF2 only

kmk/entrypoints/handwire/feather_m4_express.py

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+import sys
+from logging import DEBUG
+
+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=DEBUG,
+            matrix_scanner=MatrixScanner,
+        )
+
+        firmware.go()
+    except Exception as e:
+        sys.print_exception(e)
+        sys.exit(1)