- added BKE_pose_channel_get_mirrored (matching editmode function ED_armature_bone_get_mirrored) - editbone_name_exists -> ED_armature_bone_find_name
- added BKE_pose_channel_get_mirrored (matching editmode function ED_armature_bone_get_mirrored) - editbone_name_exists -> ED_armature_bone_find_name