Create camera list as needed, directly in draw routine.
Remove try...except clause, simply report if camera not found.
Select only active camera if its button is Ctrl-clicked.
New tool to add timeline marker bound to selected camera.
Update operator label and tooltips.
Sort camera list based on name (easier to modify and track), not order of creation.
Ctrl-click also hides all other cameras in the scene.
Change object selection and active state only in Object mode.
Merge pull request #6 from adhihargo/master

Updated to account for RestrictContext, option to select active camera, and new operator.