Create Piece: Enable overlapping of pieces when there are 6+ pieces on a point

User Story

As a user, when there are 6+ pieces on a point, I would like to see the pieces overlapping, so the board remains organized and I do not need to worry about my pieces crossing over and colliding with other pieces on other points.

Acceptance Criteria

When there are 6 or more pieces on a point, the pieces should clearly overlap to fit within the point.

Dev Notes

The official backgammon rules allows up all of one player's pieces (15 total) to be on a single point. We could perhaps increase the overlap factor for each piece added from 6 to 15.