Remove object schema type system Since libweave no longer semantically parses command/state definitions and validates commands and states, there is no need for this extra code. BUG: 25841230 Change-Id: I53dfab20db8c97b621c07fe234a7b3c6da7325bb Reviewed-on: https://weave-review.googlesource.com/1660 Reviewed-by: Vitaly Buka <vitalybuka@google.com>