Phonet performance (AU and ZA)

[aarondandy]

The method WordList.QuerySuggest.Phonet has two nested loops that query for entries from a PhoneTable that have rules starting with a given character. Indexing these entries in the table by the first rule character may have a positive impact on performance.

[aarondandy]

This may only have an impact on Australian and South African English dictionaries. A specialized performance benchmark may need to be added to notice a difference or just be lazy and modify the performance tests to use an Australian dictionary instead of an American one.