PackageManager: Add optional prelaunch check step

This ability is protected by config overlays.

Change-Id: I0c80bd9ec6bda3d21557aaa9503f05ff86adf434
Support full size application screenshots

Add optional width and height parameters for
ease of capturing entire application screenshots

Change-Id: I6d154f6b33bfb8ec90e3757a40382c1dc6feaad3