Move config-getting to VectorBasePlatform

in Electron get config via IPC from main process
which has access to the "local" config.json override file
and can make people happy :D

Remove bunch of duplicated code,
and move comments around to put them in the right place

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

src/vector/platform/ElectronPlatform.js

@@ -4,6 +4,7 @@
 Copyright 2016 Aviral Dasgupta
 Copyright 2016 OpenMarket Ltd
 Copyright 2018 New Vector Ltd
+Copyright 2019 Michael Telatynski <7t3chguy@gmail.com>
 
 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
@@ -101,6 +102,10 @@ export default class ElectronPlatform extends VectorBasePlatform {
         this.stopUpdateCheck = this.stopUpdateCheck.bind(this);
     }
 
+    async getConfig(): Promise<{}> {
+        return this._ipcCall('getConfig');
+    }
+
     async onUpdateDownloaded(ev, updateInfo) {
         dis.dispatch({
             action: 'new_version',