this first major move separates the transient beacon state cache from
the underlying tree.
leaf updates are enforced in the setters, which should make programming
easier.
all exported methods of the raw.BeaconState should be safe to call
(without disrupting internal state)
changes many functions to consume *raw.BeaconState in perparation for
interface
beyond refactor it also:
adds a pool for the leaves of the validator ssz hash
adds a pool for the snappy writers
removed the parallel hash experiment (high memory use)
- Added new requests for sending raw transactions
- Made provisions for other types of transactions generated, including
contracts
- Modified the models and services to accommodate general values
