Faster-coco-eval

- [x] Worked out the ability to work with skeletons and various key points
- [x] eval.state_as_dict Now works for key points

- [x] Change comparison to colab_example
- [x] append utils with opencv **conver_mask_to_poly** (extra)
- [x] append **drop_cocodt_by_score** for extra eval

- [x] **breaking change** | new static function COCO.load_json
- [x] new curve f1_confidence with cur.plot_f1_confidence()
- [x] **breaking change** | replace display_matrix arg in_percent to normalize
- [x] **breaking change** | rework draw functions

- [x] append Auto-formatters
- [x] append py36 support
- [x] append pandas to requirements for plotly[express]
- [x] update mask api with pycootools

- [x] append Plotly fig return
- [x] append preview GT only func. Without eval.

py
cocoGt = COCO(...)
preview = PreviewResults(cocoGt, iouType='segm')
preview.display_tp_fp_fn(data_folder=..., image_ids=..., display_gt=True)

- [x] fix issue <https://github.com/MiXaiLL76/faster_coco_eval/issues/12>
- [x] Updated pre-rec calculation method
- [x] Updated required libraries
- [x] Moved all matplotlib dependencies to plotly
- [x] Append new examples & mmeval test file