Add convenience options to glpuzzle demo

The demo exhibits a sometimes annoying /feature/ to spin the entire
puzzle if a user happens to click and/or drag the mouse somewhere on
the puzzle's background rather than on a puzzle piece.

A new command line option '-n' disables this feature entirely.

The extended menu and keyboard commands learned a new option and
keyboard shortcut 'n' => "Normal Position" to stop spinning and
to reset the puzzle to its original position.

The space key is another (hidden) shortcut for 'n'.

0 files changed, 0 insertions, 0 deletions