Release v1.9.0

• Remove the constrain of metadata file must exist before annotation, make the software can generate metadata file automatically if user choose an empty metadata folder.
• Add save setting panels to control the annotation result format, support writes bbox, poly, rbox, truncated, difficult, object pose, resolution, data source info into a specific annotation file format.
• Add showing the pixel width and height info of the selected bbox/rbox at left bottom corner of status bar.
• Change annotation file format : (1) remove yolo TXT format (2) add gfchallenge XML format, gfproject XML format (3) optimize ULTRA JSON format and VOC XML format
• Change default meta json filename to “{img_name}_meta.json”
• Change all points order into clockwise in right-hand coordinate system (Plz be aware of this!)
• Optimize annotation read/write submodule source code with inherited classes
• Fix rbox angle bug
• Fix reopen rbox may cause a deformable bug