Release BitShares Core "Splash" 5.1.0

[vlad2323]

Release BitShares Core "Splash" 5.1.0
https://github.com/bitshares/bitshares-core/releases/tag/5.1.0

The Core software is used to build the validation nodes that perform consensus of all transactions on the BitShares blockchain.
This release includes additions, improvements and bug fixes but does not include any changes to the consensus protocol.