fix: bone roll replication

More info about the issue:
https://devtalk.blender.org/t/how-to-query-determine-the-roll-of-a-bone-in-pose-object-mode/14251/2

Related to #155

multi_user/bl_types/bl_armature.py

@@ -25,6 +25,16 @@ from .. import presence, operators, utils
 from .bl_datablock import BlDatablock
 
 
+def get_roll(bone: bpy.types.Bone) -> float:
+    """ Compute the actuall roll of a pose bone
+
+        :arg pose_bone: target pose bone
+        :type pose_bone: bpy.types.PoseBone
+        :return: float
+    """
+    return bone.AxisRollFromMatrix(bone.matrix_local.to_3x3())[1]
+
+
 class BlArmature(BlDatablock):
     bl_id = "armatures"
     bl_class = bpy.types.Armature
@@ -44,7 +54,7 @@ class BlArmature(BlDatablock):
             'uuid',
             data['user'],
             bpy.data.objects
-            )
+        )
 
         if parent_object is None:
             parent_object = bpy.data.objects.new(
@@ -94,11 +104,11 @@ class BlArmature(BlDatablock):
             new_bone.head = bone_data['head_local']
             new_bone.tail_radius = bone_data['tail_radius']
             new_bone.head_radius = bone_data['head_radius']
-            # new_bone.roll =  bone_data['roll']
+            new_bone.roll =  bone_data['roll']
             
             if 'parent' in bone_data:
                 new_bone.parent = target.edit_bones[data['bones']
-                                                          [bone]['parent']]
+                                                    [bone]['parent']]
                 new_bone.use_connect = bone_data['use_connect']
 
             loader = Loader()
@@ -127,8 +137,6 @@ class BlArmature(BlDatablock):
             'parent',
             'name',
             'layers',
-            # 'roll',
-
         ]
         data = dumper.dump(instance)
 
@@ -136,6 +144,7 @@ class BlArmature(BlDatablock):
             if bone.parent:
                 data['bones'][bone.name]['parent'] = bone.parent.name
         # get the parent Object
+        # TODO: Use id_data instead
         object_users = utils.get_datablock_users(instance)[0]
         data['user'] = object_users.uuid
         data['user_name'] = object_users.name
@@ -146,6 +155,8 @@ class BlArmature(BlDatablock):
             item.name for item in container_users if isinstance(item, bpy.types.Collection)]
         data['user_scene'] = [
             item.name for item in container_users if isinstance(item, bpy.types.Scene)]
+
+        for bone in instance.bones:
+            data['bones'][bone.name]['roll'] = get_roll(bone)
+
         return data
-
-