Tiny message tweaks.
Smarter player name to ID caching.
More aggressive name/ID caching.

To 30 days from 10.
Vresion to 9.0.1
Player not found message update.
Fixes: Non-Vanilla items and offline players.

Proactive defense against non-Vanilla items changing claimed parts of
the world without permission.  Fixed offline player caching not caching
all the players it should.
Version to 9.1
merge with upstream