also improve warning box styling consistency across finalizers,
add CPFP new feerate > old feerate check,
add relayfee checks for CPFP, DSCancel,
proper warning string for no dynamic fee estimates
- Wallet.make_unsigned_transaction takes a FeePolicy parameter
- fee sliders act on a FeePolicy instead of config
- different fee policies may be used for different purposes
- do not detect dust outputs in lnsweep, delegate that to lnwatcher