(minor) Clean up spacing
Allow capital A/An too.
(minor) update nuget packages; add approval tests package so we can do nicer large-scale testing.
(minor): clean up unused usings
Bugfix: use UTF8 not system codepage for storing prefixtrie
For easier management, use non-mutating trie simplifcation.
Whoops, forgot namespace import
Tune parallelism constants
Add some reporting of overall progress
(minor) spacing.
Add approval tests for a-vs-an classification; using english dictionary, all up to 4 letter acronyms, all up to 5 letter numbers

--HG--
rename : A-vs-An/354984si.ngl => A-vs-An/AvsAn-Test/354984si.ngl