Add option for matching full or partial texts

[mfulton26]

Currently Web Automator checks to see if the desired key/text to set/click is contained within some given text on the screen but sometimes this is not desired. A RegExp can be used beginning and ending with ^ and $ respectively but an option to do strict/full/exact string matching instead of partial string matching may be better... it may even be appropriate for said option to default to "full".