Ensure block and transaction size and weight values match old codebase

[r3rcloak]

Cloak and BTC have different consensus values blocks and transactions. Cloak also have a specific MAX_BLOCK_SIZE_GEN value for PoS generated blocks. This should be followed and updated in the new codebase.

MAX_BLOCK_SIZE and MAX_BLOCK_SIZE_GEN [PoS blocks] (in old codebase)
MAX_BLOCK_SERIALIZED_SIZE and MAX_BLOCK_WEIGHT (in new codebase).

It is also critical to ensure consensus rules match when validating transactions and blocks (see CheckTransaction in tx_verify.cpp and CheckBlock in validation.cpp). Any failure here could result in a fork due to transactions or blocks being accepted by a subset of nodes due to differing block/tx consensus rules.

[r3rcloak]

This isn't critical yet but must be addressed prior to any public 'livenet' release of the new codebase.