Added pawn piece
- no Junit test for pawn yet
[feature] Basic movement of pieces is working.
[feature] Visuals on how a piece can be moved.
[needs fixing] the way pawns move.
[needs fixing] the way we calculate how pieces can be moved is convoluted..
Merge remote-tracking branch 'origin/master'

Conflicts:
	src/main/board/Board.java
	src/main/pieces/IPiece.java
	src/main/pieces/Piece.java
[feature] Visuals on how a piece can be moved.
[needs fixing] the way pawns move.
[needs fixing] the way we calculate how pieces can be moved is convoluted..