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/fill_from.tmpl

@@ -0,0 +1,20 @@
+{{ define "fill_from" }}{{ $s := . }}{{ if $s.Fields }}
+{{- /*gotype: go.mau.fi/mautrix-telegram/pkg/gotd/gen.structDef*/ -}}
+// FillFrom fills {{ $s.Name }} from given interface.
+func ({{ $s.Receiver }} *{{ $s.Name }}) FillFrom(from interface{
+{{- range $f := $s.Fields }}{{ if ne ($f.Type) ("bin.Fields") }}
+    {{ template "getter_func_type" $f }}
+{{- end }}{{- end }}
+}) {
+{{- range $f := $s.Fields }}{{ if ne ($f.Type) ("bin.Fields") }}
+    {{- /*gotype: go.mau.fi/mautrix-telegram/pkg/gotd/gen.fieldDef*/ -}}
+    {{- if and ($f.Conditional) (not $f.ConditionalBool) }}
+    if val, ok := from.Get{{ $f.Name }}(); ok {
+        {{ $s.Receiver }}.{{ $f.Name }} = val
+    }
+    {{ else }}
+    {{ $s.Receiver }}.{{ $f.Name }} = from.Get{{ $f.Name }}()
+    {{- end }}
+{{- end }}{{- end }}
+}
+{{ end }}{{ end }}