Mainnet v1.5.6

• Global Snapshot (#1250)
• Refactor: refactored DedicatedScheduledExecutorService
• Refactor: refactored AsyncTransactionPruner
• Refactor: refactored EntryPointSelectorImpl
• Refactor: refactored CumulativeWeightCalculator
• Refactor: refactored the SnapshotServiceImpl
• Refactor: refactored the SnapshotProviderImpl
• Refactor: refactored the LocalSnapshotManagerImpl
• Fix remove source port check (#1156)
• Documented IRI and Iota (#1150)
• Added documentation for networking
• Refactor: removed the repair routines for db inconsistencies
• Document dto (#1143)
• Added javadoc to API (#1140)
• Docs: fixed erroneous javadocs
• Feat: new MilestoneTracker
• Docs: fixed a problem with missing parameters in the docs
• split issues template to bug report and feature request (#1149)
• Transaction Validator Documentation (#1142)
• Document Bundle Validator (#1125)
• Document zmq-messageQ (#1141)
• Changed generic to always Transaction (#1129)
• Document crypto package (#1139)
• document converter (#1130)
• change hash package name to crypto (#1136)
• Fix: removed spamming logger
• Refactor: removed debug messages
• Feat: making IRI use the initialSnapshot and the solidEntryPoints
• Refactor: refactored changes according to codacy
• Feat: introducing several executor services for IRI
• add "numberOfStaleTransactions" to getNeighbors API call (#1121)
• Documentation explanation in styleguide (#1120)
• update regression tests
• add 'coordinatorAddress' to 'getNodeInfo' response.
• Added PearlDiver config (PoW threads) (#1017)
• Obtain features of a node (#1062)
• Refactor: changed indentation of IS_SOLID_BITMASK
• Refactor: correct name for the isMilestone flag
• Refactor: removed the requester thread in favor of a separate PR
• Refactor: changed indentation of isTransactionRequested
• Refactor: removed wrong * 4
• Regression ciglue.sh: avoid git fatal error when cloning TIAB (#1104)
• Return early if validating a bundle that has a known invalid status (#1098)
• Fixed wrong Hash objects used
• Fix: fixed visibility of the Status in the MilestoneTracker
• Feat: added hashcode to the Messages in IntervallLogger
• Feat: added the isSnapshot accessors
• Feat: fixed a few minor issues in IRI + some other improvements
• Feat: added the snapshot package
• Add Validation Test (#55)
• Interrupt wait time fix (#54)
• add code coverage to regression tests
• use mvn to fetch version
• Fix: fixed ThreadUtils to use Map instead of HashMap
• Add a Java Styleguide to IRI (#1055)
• fix code coverage tool d/l (#1085)
• javadocs param fix (#1081)
• update undertow to version 1.4.26 (#1083)
• Update DB for stitching tests (#60)
• Gawk -> Awk
• Revert "Kubectl extracted namespace could be empty"
• Kubectl extracted namespace could be empty
• Force TIAB virtualenv to Python2
• add reply to request to "recentSeenBytes" tx cache in order to skip redundant processing.
• extract byte digest to a function.
• Update DB for stitching tests
• Refactor: refactored the transactionpruner
• Enable validation of milestones with additional hash modes and security levels (#1041)
• Run regression tests from local (#58)
• add formatting files
• Fix missing responses placement for interrupt test (#53)
• rename addresses to addressList
• Move variables to world environment (#50)
• fix milestone -> milestoneTracker