Version 2.0

Breaking changes:

• Category type was migrated from numeric enum to string const assertions
• Category type values UNDEF, FALSE, NEVER, MAYBE, TRUE are now strings (not numbers).
• LogicHash interface was removed – use LogicValues interface instead.
• Logic.asHash(...) was removed – use Logic.asValues(...) instead.
• Logic.fromHash(...) was replaced by new method Logic.fromValues(...).