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/mtproxy/faketls/tls.go

@@ -0,0 +1,35 @@
+package faketls
+
+// RecordType represents TLS record type byte.
+type RecordType uint8
+
+const (
+	// RecordTypeChangeCipherSpec is ChangeCipherSpec record type byte.
+	RecordTypeChangeCipherSpec RecordType = 0x14
+	// RecordTypeAlert is Alert record type byte.
+	RecordTypeAlert RecordType = 0x15
+	// RecordTypeHandshake is Handshake record type byte.
+	RecordTypeHandshake RecordType = 0x16
+	// RecordTypeApplication is Application record type byte.
+	RecordTypeApplication RecordType = 0x17
+	// RecordTypeHeartbeat is Heartbeat record type byte.
+	RecordTypeHeartbeat RecordType = 0x18
+)
+
+// HandshakeType represents TLS handshake record type byte.
+type HandshakeType uint8
+
+const (
+	// HandshakeTypeClient is client handshake message type.
+	HandshakeTypeClient HandshakeType = 0x01
+	// HandshakeTypeServer is server handshake message type.
+	HandshakeTypeServer HandshakeType = 0x02
+)
+
+// Possible versions.
+var (
+	Version10Bytes = [2]byte{0x03, 0x01}
+	Version11Bytes = [2]byte{0x03, 0x02}
+	Version12Bytes = [2]byte{0x03, 0x03}
+	Version13Bytes = [2]byte{0x03, 0x04}
+)