Start adding API selection modal and supporting code

mobile/src/API.js

@@ -3,6 +3,8 @@ import io from "socket.io-client"
 import { AsyncStorage } from "react-native"
 
 const authTokenName = "AuthToken"
+const backendName = "backendName"
+
 let baseURL = null
 let apiPath = null
 //
@@ -46,6 +48,15 @@ class API extends EventEmitter {
     super()
     this.user = { pending: true }
 
+    AsyncStorage.getItem(backendName)
+      .then((backend) => {
+        this.backend = backend
+      })
+      .catch((err) => {
+        this.backend = "normal"
+        AsyncStorage.setItem(backendName, this.backend)
+      })
+
     AsyncStorage.getItem(authTokenName)
       .then((token) => {
         if (!token) {
@@ -105,8 +116,8 @@ class API extends EventEmitter {
     return this.user
   }
 
-  get apiURL() {
-    return baseURL + apiPath
+  get backend() {
+    return this.backend
   }
 
   makeImageUrl(id, size) {