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/gen/_template/method.tmpl

@@ -0,0 +1,62 @@
+{{- /*gotype: go.mau.fi/mautrix-telegram/pkg/gotd/gen.structDef*/ -}}
+{{ define "method" }}{{- $s := . -}}{{ if $s.Method }}
+// {{ $s.Method }} invokes method {{ $s.RawType }} returning error if any.
+{{- if $s.Docs }}
+{{- range $d := $s.Docs }}
+// {{ trim $d }}
+{{- end }}
+{{- end }}
+{{- if $s.Links }}
+    {{- template "print_links" $s.Links }}
+{{- end }}
+{{- if $s.Errors }}
+    {{- template "print_errors" $s.Errors }}
+{{- end }}
+{{- if $s.URL }}
+//
+// See {{ $s.URL }} for reference.
+{{- end }}
+{{- if $s.BotCanUse }}
+// Can be used by bots.
+{{- end }}
+{{- if $s.Result }}
+{{- if $s.ResultSingular }}
+func (c *Client) {{ $s.Method }}({{ template "request_params" $s }}) ({{ if not $s.ResultVector }}*{{ $s.Result }}{{ else }}{{ template "slice_result_name" $s }}{{ end }}, error) {
+    var result {{ $s.Result }}
+    {{ template "pack_request" $s }}
+    if err := c.rpc.Invoke(ctx, request, &result); err != nil {
+        return nil, err
+    }
+    {{- if $s.ResultVector }}
+    return {{ template "slice_result_name" $s }}(result.Elems), nil
+    {{- else }}
+    return &result, nil
+    {{- end }}
+}
+{{- else }}
+func (c *Client) {{ $s.Method }}({{ template "request_params" $s }}) ({{if ne $s.Result "BoolClass"}}{{ $s.Result }}{{ else }}bool{{ end }}, error) {
+    var result {{ $s.ResultFunc }}Box
+    {{ template "pack_request" $s }}
+    if err := c.rpc.Invoke(ctx, request, &result); err != nil {
+{{- if ne $s.Result "BoolClass" }}return nil, err{{- else }}return false, err{{- end }}
+    }
+    {{- if ne $s.Result "BoolClass" }}
+    return result.{{ $s.ResultBaseName }}, nil
+    {{- else }}
+    _, ok := result.{{ $s.ResultBaseName }}.(*BoolTrue)
+    return ok, nil
+    {{- end }}
+}
+{{- end }}
+{{- else }}
+func (c *Client) {{ $s.Method }}({{ template "request_params" $s }}) error {
+    var ok Ok
+    {{ template "pack_request" $s }}
+    if err := c.rpc.Invoke(ctx, request, &ok); err != nil {
+        return err
+    }
+    return nil
+}
+{{- end }}
+
+{{ end }}{{ end }}