Rigify: refactor feature sets to avoid modifying global path.

Instead of adding the feature set installation directory
to the global path, and thus inserting the modules into
the top level namespace, add an empty rigify.feature_sets
package and use __path__ to redirect the module loader
to read its sub-modules from the feature set directory.

Now feature set modules are effectively installed into
that package and loaded as 'rigify.feature_sets.foo'.

As an aside, clean up loading code to avoid weird path
manipulations, add more safety checks when installing sets,
and add a way for sets to expose a user-friendly name.

1 files changed, 2 insertions, 2 deletions

diff --git a/rigify/utils/__init__.py b/rigify/utils/__init__.py
index da4689a9..9fa6a3d2 100644
--- a/rigify/utils/__init__.py
+++ b/rigify/utils/__init__.py
@@ -24,8 +24,8 @@ from .widgets_special import create_neck_bend_widget, create_neck_tweak_widget
 
 from .animation import get_keyed_frames, bones_in_frame, overwrite_prop_animation
 
-from .rig import RIG_DIR, METARIG_DIR, MODULE_NAME, TEMPLATE_DIR, outdated_types, upgradeMetarigTypes
-from .rig import get_rig_type, get_metarig_module, write_metarig, get_resource
+from .rig import RIG_DIR, METARIG_DIR, TEMPLATE_DIR, outdated_types, upgradeMetarigTypes
+from .rig import write_metarig, get_resource
 from .rig import connected_children_names, has_connected_children
 
 from .layers import get_layers, ControlLayersOption