Shot Viewer: build shot cameras with Add Camera Rigs

New shot cameras come from bpy.ops.object.build_camera_rig: a crane rig
when "3D Camera" is ticked, a 2D rig otherwise (SHOT_CAMERA_RIG_MODES).
The camera and its rig are named for the sequence and shot
(SHOT_CAMERA_RIG_NAME_FORMAT). Camera rigs are left out of the rig
quick-select. Requires the Add Camera Rigs extension.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

config.py

@@ -251,6 +251,10 @@ SEQUENCE_NAME_FORMAT = "sq{:04d}"
 # Cameras added by the shot viewer. Tokens: {prefix} (OBJECT_PREFIXES["CAMERA"]),
 # {sequence} (SEQUENCE_NAME_FORMAT) and {shot} (the shot name).
 SHOT_CAMERA_NAME_FORMAT = "{prefix}{sequence}_{shot}"
+# Their rig, same tokens with {prefix} = OBJECT_PREFIXES["ARMATURE"].
+SHOT_CAMERA_RIG_NAME_FORMAT = "{prefix}{sequence}_{shot}"
+# Mode of bpy.ops.object.build_camera_rig (Add Camera Rigs add-on) for 3D and 2D cameras.
+SHOT_CAMERA_RIG_MODES = {"3D": "CRANE", "2D": "2D"}
 SHOT_NUMBER_STEP = 10
 SHOT_FRAME_START = 1001
 SHOT_DEFAULT_DURATION = 48