Add "Assign Admin" button to the rooms (#156)

* wip on make admin button

* Finish assign admin button

* fixes from pr

* update readme; remove unnecessary console.log; add assign admin to room directory and room view; rename user_id label; set own MXID by default; fix room name display when there is no name

src/i18n/index.d.ts

@@ -223,6 +223,14 @@ interface SynapseTranslationMessages extends TranslationMessages {
           success: string;
           failure: string;
         };
+        make_admin: {
+          assign_admin: string;
+          title: string;
+          confirm: string;
+          content: string;
+          success: string;
+          failure: string;
+        };
       };
     };
     reports: {