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/constant/tdlib_ids_test.go

@@ -0,0 +1,65 @@
+package constant
+
+import (
+	"strconv"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestIsID(t *testing.T) {
+	tests := []struct {
+		id      TDLibPeerID
+		user    bool
+		chat    bool
+		channel bool
+	}{
+		{id: 309570373, user: true},
+		{id: 140267078, user: true},
+		{id: -365219918, chat: true},
+		{id: -1001228418968, channel: true},
+	}
+	for _, tt := range tests {
+		t.Run(strconv.FormatInt(int64(tt.id), 10), func(t *testing.T) {
+			a := require.New(t)
+
+			a.Equal(tt.user, tt.id.IsUser())
+			a.Equal(tt.chat, tt.id.IsChat())
+			a.Equal(tt.channel, tt.id.IsChannel())
+		})
+	}
+}
+
+func TestTDLibPeerID_ToPlain(t *testing.T) {
+	tests := []struct {
+		id    TDLibPeerID
+		wantR int64
+	}{
+		{309570373, 309570373},
+		{140267078, 140267078},
+		{-365219918, 365219918},
+		{-1001228418968, 1228418968},
+	}
+	for _, tt := range tests {
+		t.Run(strconv.FormatInt(int64(tt.id), 10), func(t *testing.T) {
+			a := require.New(t)
+			plain := tt.id.ToPlain()
+			a.Equal(tt.wantR, plain)
+
+			switch {
+			case tt.id.IsUser():
+				var tdlibID TDLibPeerID
+				tdlibID.User(plain)
+				a.Equal(tt.id, tdlibID)
+			case tt.id.IsChat():
+				var tdlibID TDLibPeerID
+				tdlibID.Chat(plain)
+				a.Equal(tt.id, tdlibID)
+			case tt.id.IsChannel():
+				var tdlibID TDLibPeerID
+				tdlibID.Channel(plain)
+				a.Equal(tt.id, tdlibID)
+			}
+		})
+	}
+}