add BOB screen for ADSimDetector PVA image

[prjemian]

This BOB screen (for CSS Studio phoebus) could support the PVA1:Image from any area detector. The more ... pop-up menu has the simDetector.bob screen as the first item. (Can this be generalized?)

Call this screen with two macros:

macro	description	example
P	IOC prefix	ad:
R	cam module	cam1:

example:

[prjemian]

Compare with existing, similar screen for CaQtDM: https://github.com/areaDetector/ADCore/blob/master/ADApp/op/ui/ad_cam_image.ui