define operator properties in the class, similar to django fields

# Before
[
	bpy.props.StringProperty(attr="path", name="File Path", description="File path used for exporting the PLY file", maxlen= 1024, default= ""),
	bpy.props.BoolProperty(attr="use_modifiers", name="Apply Modifiers", description="Apply Modifiers to the exported mesh", default= True),
	bpy.props.BoolProperty(attr="use_normals", name="Export Normals", description="Export Normals for smooth and hard shaded faces", default= True),
	bpy.props.BoolProperty(attr="use_uvs", name="Export UVs", description="Exort the active UV layer", default= True),
	bpy.props.BoolProperty(attr="use_colors", name="Export Vertex Colors", description="Exort the active vertex color layer", default= True)
]

# After
path = StringProperty(attr="", name="File Path", description="File path used for exporting the PLY file", maxlen= 1024, default= "")
use_modifiers = BoolProperty(attr="", name="Apply Modifiers", description="Apply Modifiers to the exported mesh", default= True)
use_normals = BoolProperty(attr="", name="Export Normals", description="Export Normals for smooth and hard shaded faces", default= True)
use_uvs = BoolProperty(attr="", name="Export UVs", description="Exort the active UV layer", default= True)
use_colors = BoolProperty(attr="", name="Export Vertex Colors", description="Exort the active vertex color layer", default= True)

source/blender/python/intern/bpy_rna.h

@@ -91,6 +91,8 @@ PyObject *BPy_CollectionProperty(PyObject *self, PyObject *args, PyObject *kw);
 PyObject *pyrna_basetype_register(PyObject *self, PyObject *args);
 PyObject *pyrna_basetype_unregister(PyObject *self, PyObject *args);
 
+int pyrna_deferred_register_props(struct StructRNA *srna, PyObject *class_dict);
+
 /* called before stopping python */
 void pyrna_alloc_types(void);
 void pyrna_free_types(void);