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/typeutils/converter.go

@@ -26,7 +26,6 @@ import (
 	"github.com/superseriousbusiness/gotosocial/internal/ap"
 	"github.com/superseriousbusiness/gotosocial/internal/api/model"
 	"github.com/superseriousbusiness/gotosocial/internal/cache"
-	"github.com/superseriousbusiness/gotosocial/internal/config"
 	"github.com/superseriousbusiness/gotosocial/internal/db"
 	"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
 )
@@ -192,15 +191,13 @@ type TypeConverter interface {
 }
 
 type converter struct {
-	config  *config.Config
 	db      db.DB
 	asCache cache.Cache
 }
 
 // NewConverter returns a new Converter
-func NewConverter(config *config.Config, db db.DB) TypeConverter {
+func NewConverter(db db.DB) TypeConverter {
 	return &converter{
-		config:  config,
 		db:      db,
 		asCache: cache.New(),
 	}