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/internal/manager/device.go

@@ -0,0 +1,61 @@
+package manager
+
+import (
+	"runtime"
+
+	"go.mau.fi/mautrix-telegram/pkg/gotd/telegram/internal/version"
+	"go.mau.fi/mautrix-telegram/pkg/gotd/tg"
+)
+
+// DeviceConfig is config which send when Telegram connection session created.
+type DeviceConfig struct {
+	// Device model.
+	DeviceModel string
+	// Operating system version.
+	SystemVersion string
+	// Application version.
+	AppVersion string
+	// Code for the language used on the device's OS, ISO 639-1 standard.
+	SystemLangCode string
+	// Language pack to use.
+	LangPack string
+	// Code for the language used on the client, ISO 639-1 standard.
+	LangCode string
+	// Info about an MTProto proxy.
+	Proxy tg.InputClientProxy
+	// Additional initConnection parameters. For now, only the tz_offset field is supported,
+	// for specifying timezone offset in seconds.
+	Params tg.JSONValueClass
+}
+
+// SetDefaults sets default values.
+func (c *DeviceConfig) SetDefaults() {
+	const notAvailable = "n/a"
+
+	// Strings must be non-empty, so set notAvailable if default value is empty.
+	set := func(to *string, value string) {
+		if value != "" {
+			*to = value
+		} else {
+			*to = notAvailable
+		}
+	}
+
+	if c.DeviceModel == "" {
+		set(&c.DeviceModel, runtime.Version())
+	}
+	if c.SystemVersion == "" {
+		set(&c.SystemVersion, runtime.GOOS)
+	}
+	if c.AppVersion == "" {
+		set(&c.AppVersion, version.GetVersion())
+	}
+	if c.SystemLangCode == "" {
+		c.SystemLangCode = "en"
+	}
+	if c.LangCode == "" {
+		c.LangCode = "en"
+	}
+	// It's okay to use zero value Proxy.
+	// It's okay to use zero value Params.
+}