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/.editorconfig

@@ -0,0 +1,19 @@
+# editorconfig.org
+root = true
+
+[{*.patch,syntax_test_*}]
+trim_trailing_whitespace = false
+
+[{*.c,*.cpp,*.h,*.ino}]
+charset = utf-8
+
+[{*.c,*.cpp,*.h,*.ino,Makefile}]
+trim_trailing_whitespace = true
+insert_final_newline = true
+end_of_line = lf
+indent_style = space
+indent_size = 2
+
+[{*.py,*.conf,*.sublime-project}]
+indent_style = tab
+indent_size = 4