This is a massive commit which reorganizes the entire project structure
(although it is still monolithic), removes the Build classes, and
switches to Moxie, a smarter Ant build tookit based on the original
Gitblit Build classes.

The Ant build script will likely require additional fine-tuning, but
this is big step forward.

Added skeleton mechanism to update server settings via rpc.

Added setting metadata. Added server status rpc. Improved setting tab in
Manager.

Added new request type to retrieve Gitblit settings to implement the
password preferences (minLength, storage type) and federation sets.