Implement Cobra CLI tooling, Viper config tooling (#336)

* start pulling out + replacing urfave and config

* replace many many instances of config

* move more stuff => viper

* properly remove urfave

* move some flags to root command

* add testrig commands to root

* alias config file keys

* start adding cli parsing tests

* reorder viper init

* remove config path alias

* fmt

* change config file keys to non-nested

* we're more or less in business now

* tidy up the common func

* go fmt

* get tests passing again

* add note about the cliparsing tests

* reorganize

* update docs with changes

* structure cmd dir better

* rename + move some files around

* fix dangling comma

internal/federation/federatingdb/update.go

@@ -24,8 +24,10 @@ import (
 	"fmt"
 
 	"github.com/sirupsen/logrus"
+	"github.com/spf13/viper"
 	"github.com/superseriousbusiness/activity/streams/vocab"
 	"github.com/superseriousbusiness/gotosocial/internal/ap"
+	"github.com/superseriousbusiness/gotosocial/internal/config"
 	"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
 	"github.com/superseriousbusiness/gotosocial/internal/messages"
 	"github.com/superseriousbusiness/gotosocial/internal/util"
@@ -124,7 +126,8 @@ func (f *federatingDB) Update(ctx context.Context, asType vocab.Type) error {
 			return fmt.Errorf("UPDATE: error converting to account: %s", err)
 		}
 
-		if updatedAcct.Domain == f.config.Host {
+		host := viper.GetString(config.Keys.Host)
+		if updatedAcct.Domain == host {
 			// no need to update local accounts
 			// in fact, if we do this will break the shit out of things so do NOT
 			return nil