changes for local files: read below

* added pouchdb-node
* moved all logic for local files to src/main/providers/local
* added new local library section on sidebar

src/renderer/main/vueapp.js

@@ -1074,7 +1074,7 @@ const app = new Vue({
                 this.checkForThemeUpdates()
             }
 
-            ipcRenderer.send("scanLibrary",app.cfg.libraryPrefs.localPaths)
+            ipcRenderer.invoke("scanLibrary")
         },
         showFoo(querySelector, time) {
             clearTimeout(this.idleTimer);