This is a temporary fix, better checks need to
be performed once the whole process has been
validated.

Instead, use a go library that communicates with pcscd over a socket.

Also update the changes introduced by @gravityblast since this PR's
inception

consensus,core: shortcut uncle validation

params: set Rinkeby Petersburg fork block (4th May, 2019)

appveyor: Upgrade to go1.12.2

cmd: nuke geth bug, nobody is using it anyway

trie: there's no point in retrieving the metaroot

cmd/geth, internal, node, vendor: nuke geth monitor

* core/state: fix state iterator

* core: fix state iterator more elegant