WIP: update webapp to use new backend

This is still very much WIP, but I now have fast
autofocus, stage moves, image streaming, and click-to-move.

webapp/src/store.js

@@ -152,7 +152,6 @@ export default new Vuex.Store({
   actions: {},
 
   getters: {
-    uriV2: state => `${state.origin}/api/v2`,
     baseUri: state => state.origin,
     ready: state => state.available
   }