2.0.0-RC3

---------
* *MinimalState* interface simplification: *validate()* puled away from the basic trait
* *maxRollback* field added to *MinimalState*
* No *transactions* field with an optional value in *PersistentNodeViewModifier*,
use *TransactionsCarryingPersistentNodeViewModifier* descendant for modifiers with transactions.
* Non-exhaustive pattern-matching fix in *NodeViewholder.pmodModify()*
* Simplification of type parameters in many classes around the whole codebase
* *FastCryptographicHash* removed
* Some obsolete code removed, such as *temp/mining* folder, *ScoreObserver* class
* Scrypto 2.0.0
* Using tagged types instead of *Array[Byte]*, *suppertagged* microframework is used for that

2.0.0-RC2

---------
* MinimalState interface made minimal
* protocolVersion in P2P Handshake
* Scrypto 1.2.3
* BoxMinimalState moved to scorex.mid.state

Scorex 2.0 Release Candidate 1

v. 2.0.0-M4

Version 2.0.0-M3 , see release-notes.md for details

2.0.0-M2

--------

* Wallet interface
* MvStore dependency removed
* StoredBlockchain trait removed
* ViewSynchronizer trait removed
* Miner and MiningController are removed from the core
* Maven artefact has been renamed from "scorex-basics" to "scorex-core"
* blockFields method of a Block has been removed

2.0.0-M1 milestone release