Shortened new player messages to emphasize the tutorial link. Questions
asked on the test server over the years indicate many players try to
muddle through using only the text rather than watching the video, or
don't read the entire text and see the video link.
Introduced new default mode which doesn't allow pistons to move blocks
outside of land claims. This is a huge performance savings. The
original mode (still available on an opt-in basis) is also optimized for
better performance.
