v0.0.5 Tari base layer pre-alpha update

v0.0.5 Tari base layer pre-alpha update

This is a pre-alpha point release of the Tari base layer. The following summary only includes major updates since the
last release.

Note: This is the first point release since 0.0.2.

Blockchain updates

Most of the major pieces of the blockchain implementation are in place, though the wiring between the pieces is still
outstanding.

• Blockchain database API. A backend-agnostic implementation of the Blockchain DB is included inchain_storage
• Tari mempool implementation is included. See base_layer/core/mempoool
• Bulletproof Range proofs
• Benchmarks for bulletproofs
• Basic wallet functionality, including key management and signature capabilities. See base_layer/wallet
• Placeholder Blake2b-based proof-of-work algorithm included. Tari will be merge-mined with Monero, but for testing/
  testnet purposes we have a Blake2b-based PoW implementation.
• A backend-agnostic Merkle Mountain Range implementation; including "mutable" MMRs and MMR checkpoints. The
  merklemountainrange crate has been deprecated.
• A rewrite of the LMDB-backend in infrastructure/storage

Communications stack

Tari is built on a completely server-less, peer-to-peer communications network using distributed hash tables (DHT) and
public key infrastructure (PKI).

• The Tari communication stack is in Alpha. We're currently working on performance and stabilisation improvements.
• DHT service implemented for Tari node discovery and peer-to-peer communication
• Migrating the comms stack to use futures-0.3 is underway.
• A Ping-pong test application. See base_layer/p2p/examples/pingpong.rs.
• CLI text messenger demo application. See applications/console_text_messenger.

Documentation

• Several RFC documents have been put into draft stage. See https://rfc.tari.com.
• Many RFC editing fixes