More `--flags` -> UI
These are some flag options that should probably be turned into UI options.

P2Pool:
- [ ] `--addpeers`
- [ ] `--no-dns`
- [ ] `--p2p-external-port`
- [ ] `--no-upnp`
- [ ] `--no-autodiff`
- [ ] `--socks5`

XMRig:
- [ ] `--cpu-priority`
- [ ] `--print-time`
- [ ] `--verbose`
- [ ] `--pause-on-battery`