re-organize into "barrels". add utils service

src/abstractions/index.ts

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+export { MessagingService } from './messaging.service';
+export { PlatformUtilsService } from './platformUtils.service';
+export { StorageService } from './storage.service';
+export { UtilsService } from './utils.service';

src/abstractions/messaging.service.ts

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+export interface MessagingService {
+    send(subscriber: string, arg?: any): void;
+}

src/abstractions/platformUtils.service.ts

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+import { DeviceType } from '../enums/deviceType.enum';
+
+export interface PlatformUtilsService {
+    getDevice(): DeviceType;
+    getDeviceString(): string;
+    isFirefox(): boolean;
+    isChrome(): boolean;
+    isEdge(): boolean;
+    isOpera(): boolean;
+    analyticsId(): string;
+    initListSectionItemListeners(doc: Document, angular: any): void;
+    getDomain(uriString: string): string;
+    inSidebar(theWindow: Window): boolean;
+    inTab(theWindow: Window): boolean;
+    inPopout(theWindow: Window): boolean;
+    inPopup(theWindow: Window): boolean;
+    isViewOpen(): boolean;
+}

src/abstractions/storage.service.ts

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+export interface StorageService {
+    get<T>(key: string): Promise<T>;
+    save(key: string, obj: any): Promise<any>;
+    remove(key: string): Promise<any>;
+}

src/abstractions/utils.service.ts

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+export interface UtilsService {
+    copyToClipboard(text: string, doc?: Document): void;
+    getHostname(uriString: string): string;
+}