Update from master branch

[txhsl]

• Handles escape characters in JSON

• Pass ApplicationExecution to IPersistencePlugin ( Pass ApplicationExecution to IPersistencePlugin neo-project/neo#531)

• Update dependencies: (Update dependencies neo-project/neo#532)

• Akka 1.3.11
• Microsoft.AspNetCore.ResponseCompression 2.2.0
• Microsoft.AspNetCore.Server.Kestrel 2.2.0
• Microsoft.AspNetCore.Server.Kestrel.Https 2.2.0
• Microsoft.AspNetCore.WebSockets 2.2.0
• Microsoft.EntityFrameworkCore.Sqlite 2.2.0
• Microsoft.Extensions.Configuration.Json 2.2.0

• change version to v2.9.4

• Updating Unknown to Policy Fail (Updating Unknown to Policy Fail neo-project/neo#533)

• Fix a dead lock in WalletIndexer

• Downgrade Sqlite to 2.1.4 (Downgrade Sqlite to 2.1.4 neo-project/neo#535)

• RPC call gettransactionheight (RPC call gettransactionheight neo-project/neo#541)

• getrawtransactionheight

Nowadays two calls are need to get a transaction height, getrawtransaction with verbose and then use the blockhash.
Other option is to use confirmations, but it can be misleading.

• Minnor fix

• Shargon's tip

• modified

• Allow to use the wallet inside a RPC plugin (Allow to use the wallet inside a RPC plugin neo-project/neo#536)

• Improve Large MemoryPool Performance - Sort + intelligent TX reverification (Improve Large MemoryPool Performance - Sort + intelligent TX reverification neo-project/neo#500)

Improve Large MemoryPool Performance - Sort + intelligent TX reverification (neo-project#500)

• Keep both verified and unverified (previously verified) transactions in sorted trees so ejecting transactions above the pool size is a low latency operation.

• Re-verify unverified transactions when Blockchain actor is idle.

• Don't re-verify transactions needlessly when not at the tip of the chain.

• Support passing a flag to getrawmempool to retrieve both verified and unverified TX hashes.

• Support MaxTransactionsPerBlock and MaxFreeTransactionsPerBlock from Policy plugins.

• Rebroadcast re-verified transactions if it has been a while since last broadcast (high priority transactions are rebroadcast more frequently than low priority transactions.

• Policy filter GetRelayResult message (Policy filter GetRelayResult message neo-project/neo#543)

• Policy filter GetRelayResult message

• adding fixed numbering for return codes

• Removed enum fixed values

• Add some initial MemoryPool unit tests. Fix bug when Persisting the GenesisBlock (Add some initial MemoryPool unit tests. Fix bug when Persisting the GenesisBlock neo-project/neo#549)

• More MemoryPool Unit Tests. Improve Re-broadcast back-off to an increasing linear formula. (More MemoryPool Unit Tests. Improve Re-broadcast back-off to an increasing linear formula. neo-project/neo#554)

• Ensuring Object Reference check of SortedSets for speed-up (Ensuring Object Reference check of SortedSets for speed-up neo-project/neo#557)

• Minor comments update on Mempool class (Minor comments update on Mempool class neo-project/neo#556)

• Update MemoryPool Unit Test to add random fees to Mock Transactions (Update MemoryPool Unit Test to add random fees to Mock Transactions neo-project/neo#558)

• Add Unit Test for MemoryPool sort order. Fixed sort order to return descending. (Add Unit Test for MemoryPool sort order. Fixed sort order to return descending. neo-project/neo#559)

• Add unit test to verify memory pool sort order and reverification order. Fixed sort order bug.

• VerifyCanTransactionFitInPool works as intended. Also inadvertantly verified GetLowestFeeTransaction() works.

• Benchmark structure for UInt classes (Benchmark structure for UInt classes neo-project/neo#553)

• basic benchmark structure for UInt classes

• commented code2 from lights for now

• updated tests. all seem correct now

• Switch to using a benchmark method taking a method delegate to benchmark.

• Make pass.

• 1 million iterations.

• Switch to ulong for the 4th option, and it is still the same speed.

• fix test data for 50% equal data

• make test pass

• neo.UnitTests/UT_UIntBenchmarks.cs

• neo.UnitTests/UT_UIntBenchmarks.cs

• Base 20 - UInt160 tests

• neo.UnitTests/UT_UIntBenchmarks.cs

• inlined 160

• complete tests with UInt256 and UInt160

• neo.UnitTests/UT_UIntBenchmarks.cs

• Lights division calculation

• Treat lower hashes as higher priority. Fix MemoryPool UT for Hash order. (Treat lower hashes as higher priority. Fix MemoryPool UT for Hash order. neo-project/neo#563)

• Treat lower hashes as higher priority.

• Fix MemoryPool UT for Hash order.

• Renaming Trasanction in PoolItem for clarity.

• Make PoolItem independent and add PoolItem tests (Make PoolItem independent and add PoolItem tests neo-project/neo#562)

• make poolitem independent

• Merging

• Multiply by -1

• Fix other

• Fix Tx

• Removing -1 extra multiplication

• Fix

• make PoolItem internal and added test class

• Update PoolItem.cs

• added comments for PoolItem variables

• getting time from TimeProvider to allow testing

• basic test

• reset time provider

• Add Hash comparison

• Adding time provider again and equals

• Fix arithmetic

• Comment on PoolItem

• Update PoolItem.cs

• protecting tests against TimeProvider changes on fails

• reusing setup part

• fixed serialization properties

• Improve generation of creating mock DateTime values. Implement hash comparison tests.

• Adjust comment.

• Treat Claim transactions as the highest low priority transactions. (Treat Claim transactions as the highest low priority transactions + Unit test neo-project/neo#565)

• Allow persistence plugins to commit as a final step. (Allow persistence plugins to commit as a final step. neo-project/neo#568)

• Allow persistence plugins to commit as a final step.

• Plugins commit before core commits, once all plugins have handled initial work OnPersist.

• Allow PersistencePlugin to determine whether to crash if commit fails.

• Add ShouldThrowExceptionFromCommit method to IPersistencePlugin.

• Throw all commit exceptions that should be thrown in an AggregateException.

• Add a Plugin type for observing transactions added or removed from the MemoryPool. (Add a Plugin type for observing transactions added or removed from the MemoryPool. neo-project/neo#580)

• Correctly handle conversions between JSON objects (Correctly handle conversions between JSON objects neo-project/neo#586)

• Fix Non-specific error for JSON-RPC specification neo-project/neo-node#297 (Fix neo-project/neo-cli#297 neo-project/neo#587)

• Replace new JArray with .ToArray (AccountState) (Replace new JArray with .ToArray (AccountState) neo-project/neo#581)

• Ensure LocalNode to be stoped before shutting down the NeoSystem