Feat: fixed some bugs

go.mod

main.go

packages/binary/spammer/spammer.go

packages/binary/tangle/model/approver/cached_approver.go

packages/binary/tangle/tangle.go

packages/database/database.go

plugins/gossip/plugin.go

plugins/metrics/plugin.go

plugins/spa/explorer_routes.go

plugins/spa/livefeed.go

plugins/spa/plugin.go

plugins/tangle/plugin.go

plugins/webapi/spammer/plugin.go

plugins/webapi/spammer/webapi.go