Add shift+click support for row selection, add responsive option, updates for mui v4, and various fixes and improvements

• Add support for row selection with shift+click #827
• Add support for full height tables responsive option #867 and deprecates scroll option (replaced with scrollMaxHeight)
• Enable placeholder option for search bar #852
• Fixes to make tests compatible with newer mui versions #832
• Various other mui v4 fixes #836
• Allow column sorting via keyboard ("enter" key) #859
• Clarifies sortDirection options by proving "none" option and depreacting null #866
• Correct issue with inconsistent background hover display among responsive views #885
• Code and documentation cleanup #860 & #883