* add filtered results
* add feedback link
* correctly debounce fuzzy search thank you leon
* reduce calls to filterMetrics()in letter search
* clean up the alphabet type
* bug fix, filter type should be subtractive
* each filter is don;t explicitly, subtracting from the results of each
* Revert "each filter is don;t explicitly, subtracting from the results of each"
This reverts commit 5648788451.
* each filter is filtered explicitly, one after the other, subtracting from the results of each