Panda3D chess sample

Panda3D is a 3D-app-development platform.
There is a chessboard sample (can drag and move pieces) in the hello-world python samples for developers.

After long days of hardworking, as result, this modified version uses chess logic and OliThink chess engine port to python.

Setup: download, unzip with overwrite folder Panda3D\samples\Chessboard