Database updates (#144)

* start moving some database stuff around

* continue moving db stuff around

* more fiddling

* more updates

* and some more

* and yet more

* i broke SOMETHING but what, it's a mystery

* tidy up

* vendor ttlcache

* use ttlcache

* fix up some tests

* rename some stuff

* little reminder

* some more updates

internal/typeutils/converter.go

@@ -24,6 +24,7 @@ import (
 	"github.com/go-fed/activity/streams/vocab"
 	"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"
@@ -175,14 +176,18 @@ type TypeConverter interface {
 }
 
 type converter struct {
-	config *config.Config
-	db     db.DB
+	config        *config.Config
+	db            db.DB
+	frontendCache cache.Cache
+	asCache       cache.Cache
 }
 
 // NewConverter returns a new Converter
 func NewConverter(config *config.Config, db db.DB) TypeConverter {
 	return &converter{
-		config: config,
-		db:     db,
+		config:        config,
+		db:            db,
+		frontendCache: cache.New(),
+		asCache:       cache.New(),
 	}
 }