Feature request: Implement findElementByImage

[30atm]

Hi,
Given an application, I would like to take a screenshot of a certain area and store it in a file.
I would like to locate an element based on its screenshot image.

[rachitgoel89]

I have a menu which does not attach to the root session. I was trying out some proprietary tools and the only way to solve this problem using them was to use image rendering. It would be great to have this feature for WAD since desktop applications can have some challenging elements to identify and it may not be able to change the code every now and then since there is a lot of legacy code that is running underneath.