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/sanguino1284p

@@ -0,0 +1,28 @@
+#!/usr/bin/env bash
+#
+# Build tests for AVR ATmega 1284p
+#
+
+# exit on first failure
+set -e
+
+#
+# Start with default configurations...
+#
+restore_configs
+opt_set MOTHERBOARD BOARD_SANGUINOLOLU_12 \
+        LCD_LANGUAGE de \
+        CONTROLLER_FAN_PIN 27
+opt_enable MINIPANEL USE_CONTROLLER_FAN CONTROLLER_FAN_EDITABLE
+exec_test $1 $2 "Default Configuration | MINIPANAL | CONTROLLER_FAN" "$3"
+
+#
+# Start with default configurations...
+#
+restore_configs
+opt_set MOTHERBOARD BOARD_MELZI
+opt_enable ZONESTAR_LCD
+exec_test $1 $2 "Default Configuration | ZONESTAR_LCD " "$3"
+
+# clean up
+restore_configs