for KMD it should be 10, according to prev implementation in
WaitForShutdown, for assetchains it should be ASSETCHAINS_BLOCKTIME/5

should be +1 bcz it was loop for(i=0; i<=ASSETCHAINS_BLOCKTIME/5;i++)
in original loop.

we don't need iterate all nodes stats inside a miner to know
max of (nStartingHeight, nSyncHeight, nCommonHeight) to get
longestchain. it's wasting CPU resources. also we don't need
additional locks directly in miner.

If any vout of tx is belongs to wallet (IsMine(tx) == true) and tx is not from us, mean,
if every vin not belongs to our wallet (IsFromMe(tx) == false), then tx need to be checked
through wallet filter. If tx haven't any vin from trusted / whitelisted address it shouldn't
be added into wallet.

Using GetTransaction instead of myGetTransaction to get prevTx and
determine vins addresses. This will allow walletfilter code to work
without txindex=1 on any (!) nodes, not only notaries. If even one
-whitelistaddress arg set wallet filter is enabled and should allow
incoming txes from any addresses belongs to wallet (even watch-only)
and addresses listed in -whitelistaddress args. If -whitelistaddress
arg is not set wallet filter is disabled.

- https://medium.com/@lukedashjr/cve-2018-20586-disclosure-ff3e1ab9a21f
- https://github.com/bitcoin/bitcoin/pull/14618/files

A rare race condition may trigger while awaiting the body of a message, see
upsteam commit libevent/libevent@5ff8eb2 for details.

This may fix some reported rpc hangs/crashes.

Issue: bitcoin/bitcoin#11593

Commits:
- bitcoin/bitcoin@6b58360
- bitcoin/bitcoin@97932cd

Equivalent to zcash#4245

Issue: zcash#3161
Fix commit: zcash@b3594b5