Orca Screen Reader Updated for GNOME 3.20.2 with Performance Improvements

Orca 3.20.2 arrives today with various performance improvements, such as support for cache results for the shouldInferLabelFor() function, as well as the ability to verify setting before attempting to generate spoken indentation information. Moreover, the findObjectInContents() function now receives smarts for embedded children, the application can cache results during filtering contents for the presentation, and it takes interfaces into account before attempting to search for non-descendable descendants.