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/registry.tmpl

@@ -0,0 +1,51 @@
+{{- /*gotype: go.mau.fi/mautrix-telegram/pkg/gotd/gen.config*/ -}}
+
+{{ define "registry" }}
+{{ $pkg := $.Package }}
+{{ template "header" $ }}
+
+{{- if $.Layer }}
+// Layer version of schema.
+const Layer = {{ $.Layer }}
+{{- end }}
+
+// TypesMap returns mapping from type ids to TL type names.
+func TypesMap() map[uint32]string {
+  return map[uint32]string {
+{{- range $elem := $.Registry }}
+    {{ $elem.Name }}TypeID: "{{ $elem.Raw }}",
+{{- end }}
+  }
+}
+
+// NamesMap returns mapping from type names to TL type ids.
+func NamesMap() map[string]uint32 {
+  return map[string]uint32 {
+{{- range $elem := $.Registry }}
+    "{{ trimSuffix (trimSuffix ($elem.Raw) ($elem.HexID)) ("#") }}": {{ $elem.Name }}TypeID,
+{{- end }}
+  }
+}
+
+// TypesConstructorMap maps type ids to constructors.
+func TypesConstructorMap() map[uint32]func() bin.Object {
+return map[uint32]func() bin.Object {
+{{- range $elem := $.Registry }}
+    {{ $elem.Name }}TypeID: func() bin.Object { return &{{ $elem.Name }}{} },
+{{- end }}
+  }
+}
+
+// ClassConstructorsMap maps class schema name to constructors type ids.
+func ClassConstructorsMap() map[string][]uint32 {
+return map[string][]uint32 {
+{{- range $elem := $.Interfaces }}
+    {{ $elem.Name }}Name: {
+    {{- range $c := $elem.Constructors }}
+        {{ $c.Name }}TypeID,
+    {{- end }}
+    },
+{{- end }}
+}
+}
+{{ end }}