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/peers/multichat.go

@@ -0,0 +1,32 @@
+package peers
+
+import (
+	"context"
+
+	"github.com/go-faster/errors"
+
+	"go.mau.fi/mautrix-telegram/pkg/gotd/tg"
+)
+
+func (m *Manager) editAbout(ctx context.Context, p tg.InputPeerClass, about string) error {
+	if _, err := m.api.MessagesEditChatAbout(ctx, &tg.MessagesEditChatAboutRequest{
+		Peer:  p,
+		About: about,
+	}); err != nil {
+		if _, ok := p.(*tg.InputPeerChat); ok {
+			return errors.Wrap(err, "edit chat about")
+		}
+		return errors.Wrap(err, "edit channel about")
+	}
+	return nil
+}
+
+func (m *Manager) editReactions(ctx context.Context, p tg.InputPeerClass, reactions tg.ChatReactionsClass) error {
+	if _, err := m.api.MessagesSetChatAvailableReactions(ctx, &tg.MessagesSetChatAvailableReactionsRequest{
+		Peer:               p,
+		AvailableReactions: reactions,
+	}); err != nil {
+		return errors.Wrap(err, "set reactions")
+	}
+	return nil
+}