Get thumbnail from app (#68)

* Renamed multipart filed name 'files' to 'assetData'. 
* Added an additional field name of 'thumbnailData' to multipart form.
* Implemented upload mechanism for thumbnail directly from the mobile client.
* Removed dead code
* Implemented a version checking mechanism.

server/src/api-v1/asset/asset.module.ts

@@ -8,9 +8,12 @@ import { AssetOptimizeService } from '../../modules/image-optimize/image-optimiz
 import { BullModule } from '@nestjs/bull';
 import { BackgroundTaskModule } from '../../modules/background-task/background-task.module';
 import { BackgroundTaskService } from '../../modules/background-task/background-task.service';
+import { CommunicationModule } from '../communication/communication.module';
 
 @Module({
   imports: [
+    CommunicationModule,
+
     BullModule.registerQueue({
       name: 'optimize',
       defaultJobOptions: {