CURA-5164 Make the mesh readers compliant with the new signature of the mesh reader. Also adapt the tests.

plugins/GCodeGzReader/GCodeGzReader.py

@@ -12,11 +12,11 @@ from UM.PluginRegistry import PluginRegistry
 #   If you're zipping g-code, you might as well use gzip!
 class GCodeGzReader(MeshReader):
 
-    def __init__(self):
-        super().__init__()
+    def __init__(self, application):
+        super().__init__(application)
         self._supported_extensions = [".gcode.gz"]
 
-    def read(self, file_name):
+    def _read(self, file_name):
         with open(file_name, "rb") as file:
             file_data = file.read()
         uncompressed_gcode = gzip.decompress(file_data).decode("utf-8")

plugins/GCodeGzReader/__init__.py

@@ -21,4 +21,4 @@ def getMetaData():
 
 def register(app):
     app.addNonSliceableExtension(".gz")
-    return { "mesh_reader": GCodeGzReader.GCodeGzReader() }
+    return { "mesh_reader": GCodeGzReader.GCodeGzReader(app) }