2.0.0-pre-rc.22.2

Added

• bounded discrete time (#4928)
• add missing mathematical operations to Numeric (#4976)

Changed

• sign only block's header, not the whole payload (#5000)
• use HashOf<BlockHeader> as the type of the block hash (#4998)
• Don't validate transactions inside WASM (#4995)

Fixed

• remove expired transaction from cache (#4922)
• Serialize WASM code for snapshots (#5009)
• correctly handle replace_top_block (#4870)
• validate block sync messages (#4965)
• prevent redundant blocksync block messages (#4909)
• use GET for blocks stream (#4990)
• Improve queue transactions handling (#4947)
• display more error details (#4973)
• prevent deadlock on simultaneous sending large message (#4948)