Convert view_user dispatch to prove the conversion works

This is a relatively obvious dispatch action that doesn't require a lot of complicated type definitions, so should be a good candidate to prove the thing works. If for some reason the thing stops working, we've done something wrong.

This also adds a bit of generic types to the dispatch call so we don't confuse the tsx parser by using `dis.dispatch(<ViewUserPayload>{...})` as it thinks that's supposed to be a component. We still get type safety, and the thing remains happy with the generics approach.

src/components/views/rooms/MemberInfo.js

@@ -48,6 +48,7 @@ import E2EIcon from "./E2EIcon";
 import AutoHideScrollbar from "../../structures/AutoHideScrollbar";
 import {MatrixClientPeg} from "../../../MatrixClientPeg";
 import MatrixClientContext from "../../../contexts/MatrixClientContext";
+import {Action} from "../../../dispatcher/actions";
 
 export default createReactClass({
     displayName: 'MemberInfo',
@@ -724,7 +725,7 @@ export default createReactClass({
 
     onCancel: function(e) {
         dis.dispatch({
-            action: "view_user",
+            action: Action.ViewUser,
             member: null,
         });
     },

src/components/views/rooms/MemberTile.js

@@ -23,6 +23,7 @@ import * as sdk from "../../../index";
 import dis from "../../../dispatcher/dispatcher";
 import { _t } from '../../../languageHandler';
 import { MatrixClientPeg } from "../../../MatrixClientPeg";
+import {Action} from "../../../dispatcher/actions";
 
 export default createReactClass({
     displayName: 'MemberTile',
@@ -185,7 +186,7 @@ export default createReactClass({
 
     onClick: function(e) {
         dis.dispatch({
-            action: 'view_user',
+            action: Action.ViewUser,
             member: this.props.member,
         });
     },