Slick Moves: Various improvements to local setup

[Shadowfiend]

The highlights:

• Using npx truffle to remove the global truffle requirement. This has some dependent PRs that need to be merged first, since it also hits install scripts in other repos: keep-network/keep-core#2021, keep-network/keep-ecdsa#538, keep-network/tbtc#727.
• Updating the Electrum config suggested in manual-setup for the dApp; the updated code depends on keep-network/tbtc.js#81. This will be obsoleted by a tbtc-dapp PR that handles the local network directly, keep-network/tbtc-dapp#356, but which does not block this PR.
• Move geth to Clique PoA. This should significantly reduce CPU load for the local setup (once those pesky primes are generated).
• Move geth to a system-designated port. This handles ethereum/go-ethereum#1271, which I ran into.

Drafted until upstream PRs are merged.

[Shadowfiend]

Once the upstreams are merged, I'm also going to bump this to latest master.

Also, I was thinking about switching the submodules to use branch tracking for master. Thoughts? Basically that means whenever you git submodule update you pull the latest version of that branch from the remote, rather than being fixed on one commit.

[lukasz-zimnoch]

Once the upstreams are merged, I'm also going to bump this to latest master.

Also, I was thinking about switching the submodules to use branch tracking for master. Thoughts? Basically that means whenever you git submodule update you pull the latest version of that branch from the remote, rather than being fixed on one commit.

Yeah, good point. We are already doing this but only during the installation in https://github.com/keep-network/local-setup/blob/master/install-repositories.sh

[Shadowfiend]

Actually I misread how --remote works. We can leave the branch off, since by doing that I believe we get the remote default branch anyway.