move gotd fork into repo. (#111)

- update to latest telegram layer
- remove some references to fields in tg.Entities that don't exist in
the schema
- originally added here:
https://github.com/beeper/td/commit/820929062a2ba0104397bc01235ab58a9cff780e
  - referenced here
-
https://github.com/mautrix/telegramgo/commit/124f0967ed195b5a380c9bd02e170ada9710dde3
-
https://github.com/mautrix/telegramgo/commit/4205047aab2e0639217148b5d125bfaab668bd8e

pkg/gotd/telegram/auth/qrlogin/accept.go

@@ -0,0 +1,20 @@
+package qrlogin
+
+import (
+	"context"
+
+	"github.com/go-faster/errors"
+
+	"go.mau.fi/mautrix-telegram/pkg/gotd/tg"
+)
+
+// AcceptQR accepts given token.
+//
+// See https://core.telegram.org/api/qr-login#accepting-a-login-token.
+func AcceptQR(ctx context.Context, raw *tg.Client, t Token) (*tg.Authorization, error) {
+	auth, err := raw.AuthAcceptLoginToken(ctx, t.token)
+	if err != nil {
+		return nil, errors.Wrap(err, "accept")
+	}
+	return auth, nil
+}