Update vscode settings

Make project ready for vscode xcodebuilt extension

GParser: Fixed bug in parseXRefStream:

GParser: Add parseXRefStream:

Add test case to help validating GStream encoded stream from project Caprice

Update README.md

GObjects: Introduce GXRefStreamEntry class

GParser: Introduce XRefStreamEntryType

GParserTests: Modify testGParserParseXRefStream method

GParserTests: Add testGParserParseXRefStream prototype method

Add test file `xref_stream_example.txt`

GTextEditor: Fixed crash due to not update text editor properties in mouseDown:

GTextEditor, GPage: Keep only one copy of the same external new added fonts font in page's new added fonts

Update README.md

GTextEditor: Use MacRomanEncoding instead by default