A few bug fixes and optimizations.
- [fix #216] 2D auxiliary lines and point cloud RGB support.
- [fix #223] Request URI too large.
- [fix #240] TempDataId duplicated when uploading dataset.
- [fix #234] AnnotationStatus of data not change when submit.
- Increase nginx body size limit to 1TB.
- Do not load all content into browser memory when uploading file.