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.service.ts

@@ -24,6 +24,12 @@ export class AssetService {
     private assetRepository: Repository<AssetEntity>,
   ) {}
 
+  public async updateThumbnailInfo(assetId: string, path: string) {
+    return await this.assetRepository.update(assetId, {
+      resizePath: path,
+    });
+  }
+
   public async createUserAsset(authUser: AuthUserDto, assetInfo: CreateAssetDto, path: string, mimeType: string) {
     const asset = new AssetEntity();
     asset.deviceAssetId = assetInfo.deviceAssetId;