Far too many changes to track, but the key ones are:

1. rewrite of the Haven variation of the Pricing Record class to support:
   - versioning of the PR format
   - nested supply_data and asset_data structs
   - verification of the signature using a variable-length string (not R+S)

2. calculation of the slippage tallies for a block in add_block(), so that
   we can work out the yield that is due to be paid out for the block.

Loads of little fixes and cleanups.

src/cryptonote_core/cryptonote_tx_utils.cpp

@@ -1,4 +1,5 @@
 // Copyright (c) 2014-2022, The Monero Project
+// Portions Copyright (c) 2023, Fulmo (author: SRCG)
 // 
 // All rights reserved.
 //