Support Bitcoin Core v30.0

[jamillambert]

The changes in terms of RPC calls and return types don't seem to be that large. From running a script to compare it to v29:

EDIT: updated below based on further testing

Added (Already there since v17 but hidden #333):

• Blockchain
  • waitforblock
  • waitforblockheight
  • waitfornewblock

Removed:

• addmultisigaddress
• dumpprivkey
• dumpwallet
• getunconfirmedbalance
• importaddress
• importmulti
• importprivkey
• importpubkey
• importwallet
• newkeypool
• sethdseed
• upgradewallet

Changed:

• Blockchain
  • getmempoolinfo
• Mining
  • getmininginfo
• Rawtransactions
  • decodepsbt
• Wallet
  • getwalletinfo
  • migratewallet
  • listwalletdir
  • settxfee

[tcharding]

Thanks for writing this up. If you are motivated I'd say this is reasonable high priority for us now that its released already.

[jamillambert]

Support added in #387. Next step is to implement the changes to the RPCs.