Rigify: add utility and operator classes for the upcoming face rigs.

- LazyRef utility class that provides a hashable field reference.
- NodeMerger plugin for grouping abstract points by distance.
- pose.rigify_copy_single_parameter operator for copying a single
  property to all selected rigs that inherit from a specific class
  (intended to be used via property panel buttons).

1 files changed, 6 insertions, 0 deletions

diff --git a/rigify/rig_lists.py b/rigify/rig_lists.py
index 49cc9545..ae7d9d00 100644
--- a/rigify/rig_lists.py
+++ b/rigify/rig_lists.py
@@ -80,6 +80,12 @@ def get_rigs(base_dir, base_path, *, path=[], feature_set=feature_set_list.DEFAU
 rigs = {}
 implementation_rigs = {}
 
+def get_rig_class(name):
+    try:
+        return rigs[name]["module"].Rig
+    except (KeyError, AttributeError):
+        return None
+
 def get_internal_rigs():
     global rigs, implementation_rigs