Added new class 'AStringNaturalComparison' that performs a 'natural sort' of strings, meaning that consecutive digits are treated as a single character so that strings containing digits are properly sorted.
Use new AStringNaturalComparison for sorting label tables by name.
Remove NameIndexSort class as it is no longer used.
Resolve WB-183 Sort Label Selection by Key Number: Added a new class AStringNaturalComparison that is used as a function object for sorting string by 'natural order' (numeric sequences are treated as as a single character/number).
Cleaned up a couple of items in new String Natural Comparison class.