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/processing/media/media.go

@@ -23,7 +23,6 @@ import (
 
 	"codeberg.org/gruf/go-store/kv"
 	apimodel "github.com/superseriousbusiness/gotosocial/internal/api/model"
-	"github.com/superseriousbusiness/gotosocial/internal/config"
 	"github.com/superseriousbusiness/gotosocial/internal/db"
 	"github.com/superseriousbusiness/gotosocial/internal/gtserror"
 	"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
@@ -44,17 +43,15 @@ type Processor interface {
 
 type processor struct {
 	tc           typeutils.TypeConverter
-	config       *config.Config
 	mediaHandler media.Handler
 	storage      *kv.KVStore
 	db           db.DB
 }
 
 // New returns a new media processor.
-func New(db db.DB, tc typeutils.TypeConverter, mediaHandler media.Handler, storage *kv.KVStore, config *config.Config) Processor {
+func New(db db.DB, tc typeutils.TypeConverter, mediaHandler media.Handler, storage *kv.KVStore) Processor {
 	return &processor{
 		tc:           tc,
-		config:       config,
 		mediaHandler: mediaHandler,
 		storage:      storage,
 		db:           db,