refactor: make local a singleton

packages/transactionspammer/transactionspammer.go

plugins/analysis/client/plugin.go

plugins/autopeering/autopeering.go

plugins/autopeering/local/local.go

plugins/autopeering/local/parameters.go

plugins/autopeering/parameters.go

plugins/autopeering/plugin.go

plugins/dashboard/tps.go

plugins/gossip/gossip.go

plugins/statusscreen/ui_header_bar.go

plugins/ui/nodeInfo.go

plugins/webapi-send-data/plugin.go