Add the beginnings of a GCode writer plugin

GCodeWriter.py

@@ -0,0 +1,5 @@
+from UM.Mesh.MeshWriter import MeshWriter
+
+class GCodeWriter(MeshWriter):
+    def __init__(self):
+        super().__init__()

__init__.py

@@ -0,0 +1,24 @@
+from . import GCodeWriter
+
+from UM.i18n import i18nCatalog
+
+catalog = i18nCatalog('plugins')
+
+def getMetaData():
+    return {
+        'type': 'mesh_writer',
+        'plugin': {
+            'name': 'GCode Writer',
+            'author': 'Arjen Hiemstra',
+            'version': '1.0',
+            'description': catalog.i18nc('GCode Writer Plugin Description', 'Writes GCode to a file')
+        },
+
+        'mesh_writer': {
+            'extension': 'gcode',
+            'description': catalog.i18nc('GCode Writer File Description', 'GCode File')
+        }
+    }
+
+def register(app):
+    return GCodeWriter.GCodeWriter()