Add Marlin firmware. Has initial configuration for CoreXY and 1 servo.

Update CAD file with improved clearances for Pilot G2 cartridge clearances after first print.

Marlin Firmware/buildroot/tests/NUCLEO_F767ZI

@@ -0,0 +1,18 @@
+#!/usr/bin/env bash
+#
+# Build tests for NUCLEO_F767ZI
+#
+
+# exit on first failure
+set -e
+
+#
+# Build with the default configurations
+#
+restore_configs
+opt_set MOTHERBOARD BOARD_NUCLEO_F767ZI SERIAL_PORT -1 X_DRIVER_TYPE TMC2209 Y_DRIVER_TYPE TMC2208
+opt_enable BLTOUCH Z_SAFE_HOMING SPEAKER SOFTWARE_DRIVER_ENABLE
+exec_test $1 $2 "Mixed timer usage" "$3"
+
+# clean up
+restore_configs