Zecwallet

Fix a minor bug where binary memos weren't read properly.

This version of Zecwallet Light CLI and SDK switches the default sync algorithm to BlazeSync.

This is a bugfix release (beta 2) for BlazeSync. Thank you to everyone that tested it out and reported bugs!

This version introduces BlazySync, a super fast sync for Zecwallet.
- Syncs the entire zcash chain, from the first sapling block, in under 60 s
- Wallet funds are ready to be spent in seconds
- Requests the exact same data from LightwalletD, so no change in security or trust assumptions.

Please read our [forum post for more details](https://forum.zcashcommunity.com/t/zecwallets-blazesync-sync-entire-chain-in-60s/39447)

Notes:
- This beta stores the wallet in a new file, called `zecwallet-light-wallet.blazesync.beta.dat`
- It will use your existing wallet if available, or create a new one.
- No change in API. All your existing apps and integrations should Just Work™. Please file bugs if you see anything amiss.

- Use accurate historical prices when showing transaction information. A `zec_price` field is included with every transaction
- Fetch current price and historical prices from LightwalletD

- Add LightwalletD compatibility. Zecwallet Lite can now connect to any LightwalletD and is also API compatible with the ECC's LightwalletD
- Add "Instant startup", where new wallets are ready instantly and don't need to sync.