Added a copy of the picojson library (C++ header).
Updated license terms.

1. Added PicoJSON license notice.
2. Clarified where the Valve stuff starts and ends.
Updated State to use appdb API versions.

1. Updated various directory locations.  This will eventually be in a
common header that is kept in sync with the tools.
2. Added json loading of the appdb json settings.
Updated Bridge's state to fully use json.

1. Death to libconfig!  (Sorry, I didn't mean that - I don't hate you
libconfig).
Further death to libconfig!

1. Bridge no longer links against libconfig!
Removed the old setup/update scripts.

1. Root Makefile now has deploy/redeploy, which uses the tools/deploy
script.
Updated documentation to the latest behavior.