Blender script: Camera additions

design4use writes:

I wrote a small script to make managing multiple cameras in the 3D viewport a little easier for me, sharing here in hopes it's useful for others:

Adds these actions to the View|Cameras menu in 3D view:

• View → Camera : set the current camera to the 3D view
• View → Add Camera : add a new camera and set it to the 3D view
• Camera → View : Set the 3D view to the current camera
• Previous Camera : Use the previous camera (if multiple cameras set up)
• Next Camera : Use the next camera (if multiple cameras set up)

Inspired by original code for camera_fit_view by Yashar JafarKhanpour and for cyclecameras by CoDEmanX