Add camera rigs: add 2D camera rig

This rig is mostly useful for 2D shots, when the camera is static and
the action happens in front of it (like a theatre stage).

In a 2D production (and some shots in 3D as well), you sometimes need
to rotate the camera while zooming, effectively "cropping" the field,
just as you would using a rostrum camera. This is tedious and
error-prone if animating built-in basic transforms, so this rig
implements a more intuitive way to do that, by just animating the two
lower corners of the camera's field.

Also improved other stuff in the add-on:
- add the GPL license block to create_widgets.py;
- rename "arm[ature]" to "rig" in some functions, for consistency and
  to avoid confusion with the crane's arm;
- changes to the UI panel:
  - remove the boxes,
  - put focal length at the top of the panel,
  - group related properties using aligned columns,
  - change the Make Camera Active operator's poll method, so that it
    is always visible in the UI, but greyed out when the camera is
    already active.

1 files changed, 2 insertions, 2 deletions

diff --git a/add_camera_rigs/__init__.py b/add_camera_rigs/__init__.py
index 6b577199..6f9f9eeb 100644
--- a/add_camera_rigs/__init__.py
+++ b/add_camera_rigs/__init__.py
@@ -18,8 +18,8 @@
 
 bl_info = {
     "name": "Add Camera Rigs",
-    "author": "Wayne Dixon, Brian Raschko, Kris Wittig, Damien Picard",
-    "version": (1, 4, 2),
+    "author": "Wayne Dixon, Brian Raschko, Kris Wittig, Damien Picard, Flavio Perez",
+    "version": (1, 4, 3),
     "blender": (2, 80, 0),
     "location": "View3D > Add > Camera > Dolly or Crane Rig",
     "description": "Adds a Camera Rig with UI",