Extract from chess-mobile project

by Stanisław Kabaciński, 2017

To see how a PGN file is loaded into memory, please refer to TestPgnRead class in "test" package.

Change history:

• 2018/09/01 - added class test.TestPgnRead (mszelag)
• 2018/12/16 - added comments in test.TestPgnRead class (mszelag)
• 2018/12/16 - package chess.mobile.chessgame renamed to chess.parser (mszelag)
• 2020/02/15 - add notifying observers of ObservableChessBoard on makeMove with coordinates passed (wkups)
• 2020/02/15 - migrate project to gradle (wkups)