Add more sigchain data verification and fix sigalgo for last elem

Signed-off-by: Yilun <[email protected]>

Add config and gui helper for makefile crossbuild

Signed-off-by: Yilun <[email protected]>

Fix nknc genid not working

Signed-off-by: Yilun <[email protected]>

Add LowFeeTxnSizePerBlock to control low fee txn size per block

Signed-off-by: Yilun <[email protected]>

Implement dropping nanopay txn in txpool

Signed-off-by: Yilun <[email protected]>

Retry syncing block with halfing batch size if fails

Signed-off-by: Yilun <[email protected]>

Change subscribe limit update height for faster upgrade

Signed-off-by: Yilun <[email protected]>

Increase robustness to extremely slow nodes

Upgrade to the latest nnet version to achieve:
* Increase measured RTT if ping msg timeout: This will avoid
packets being routed to recently timeout neighbor
* Update lastRxTime only when receiving ping message: This may
fix the case when remote node has extremely slow upstream
bandwidth and all message timeout, but it still stays in other
nodes' neighbors.
* ToRemoteNodeList only returns remote nodes that are not stopped

Signed-off-by: Yilun <[email protected]>

Excluding outdated neighbors when prefilling votes

Signed-off-by: Yilun <[email protected]>

Increase protocol and net version

Signed-off-by: Yilun <[email protected]>