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/BIGTREE_SKR_PRO

@@ -0,0 +1,33 @@
+#!/usr/bin/env bash
+#
+# Build tests for STM32F407ZG BigTreeTech SKR Pro
+#
+
+# exit on first failure
+set -e
+
+#
+# Build with the default configurations
+#
+restore_configs
+opt_set MOTHERBOARD BOARD_BTT_SKR_PRO_V1_1 SERIAL_PORT 1
+exec_test $1 $2 "BigTreeTech SKR Pro | Default Configuration" "$3"
+
+restore_configs
+opt_set MOTHERBOARD BOARD_BTT_SKR_PRO_V1_1 SERIAL_PORT -1 \
+        EXTRUDERS 3 TEMP_SENSOR_1 1 TEMP_SENSOR_2 1 \
+        E0_AUTO_FAN_PIN PC10 E1_AUTO_FAN_PIN PC11 E2_AUTO_FAN_PIN PC12 \
+        X_DRIVER_TYPE TMC2209 Y_DRIVER_TYPE TMC2130
+opt_enable BLTOUCH EEPROM_SETTINGS AUTO_BED_LEVELING_3POINT Z_SAFE_HOMING PINS_DEBUGGING
+exec_test $1 $2 "BigTreeTech SKR Pro | 3 Extruders | Auto-Fan | BLTOUCH | Mixed TMC" "$3"
+
+restore_configs
+opt_set MOTHERBOARD BOARD_BTT_SKR_PRO_V1_1 SERIAL_PORT -1 \
+        CUTTER_POWER_UNIT PERCENT \
+        SPINDLE_LASER_PWM_PIN HEATER_1_PIN SPINDLE_LASER_ENA_PIN HEATER_2_PIN \
+        TEMP_SENSOR_COOLER 1000 TEMP_COOLER_PIN PD13
+opt_enable LASER_FEATURE REPRAP_DISCOUNT_SMART_CONTROLLER
+exec_test $1 $2 "BigTreeTech SKR Pro | Laser (Percent) | Cooling | LCD" "$3"
+
+# clean up
+restore_configs