Implemented pair adjustment positioning table format 2
- added Class1Record.as
- added Class2Record.as
- completed PairAdjustmentPositioningSubtable2.as, added missing fields and properties
- implemented parsing of PairAdjustmentPositioningSubtable2.as in PairAdjustmentPositioningSubtableParser.as
- implemented performLookup in PairAdjustmentPositioningSubtable2.as