Implemented parsing of Class Definition Tables and GDEF Table Headers
- added IClassDefinitionTable.as
- added ClassDefinitionTableData1.as
- added ClassDefinitionTableData2.as
- added ClassRangeRecord.as
- added GlyphDefinitionHeader.as
- added GlyphDefinitionTableData.as
- added ClassDefinitionTableParser.as
- added GlyphDefinitionTableParser.as