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/make_vector.go

@@ -0,0 +1,56 @@
+package gen
+
+import (
+	"strings"
+
+	"github.com/gotd/tl"
+)
+
+func (g *Generator) makeVector(className string) (class classBinding, err error) {
+	class, ok := g.classes[className]
+	if ok {
+		return class, nil
+	}
+
+	elementName := strings.TrimPrefix(className[:len(className)-1], "Vector<")
+	goElementName := g.classes[elementName].Name
+	if goElementName == "" {
+		goElementName = elementName
+	}
+
+	f, err := g.makeField(tl.Parameter{
+		Name: "Elems",
+		Type: tl.Type{
+			Name: "Vector",
+			GenericArg: &tl.Type{
+				Name: elementName,
+			},
+		},
+	}, nil)
+	if err != nil {
+		return class, err
+	}
+	f.Comment = []string{"Elements of " + className}
+
+	goName := strings.Title(goElementName) + "Vector"
+	class = classBinding{
+		Name:     goName,
+		Func:     f.Type,
+		Singular: true,
+		Vector:   true,
+	}
+	g.classes[className] = class
+
+	g.structs = append(g.structs, structDef{
+		Name:     goName,
+		Receiver: "vec",
+		BufArg:   "b",
+		RawType:  className,
+		Vector:   true,
+		Fields:   []fieldDef{f},
+		BaseName: goName,
+		Comment:  goName + " is a box for " + className,
+	})
+
+	return class, nil
+}