Support rotation

[Skwarson96]

HI! I added the functionality of drawing rotated frames
to test it you need to add appropriate keys to the annotated json file.
"attributes": { "occluded": false, "rotation": 60 }

Example:
{ "id": 1, "image_id": 1, "category_id": 1, "segmentation": [], "area": 1721.5952, "bbox": [ 282.86, 459.49, 89.48, 19.24 ], "iscrowd": 0, "attributes": { "occluded": false, "rotation": 318.30000076003773 }

I added requirements.txt file too, I don't know if it will come in handy

[tarasio-mirror]

@Skwarson96 Thanks a lot for the PR!
I'll try review it asap!

What are possible use cases for this feature?

[Skwarson96]

@trsvchn thanks for answer!
Feature can be use to show rotated frames saved in coco files. I prepared a simple example (frame categories are random, it's just to visualize the rotation)

Here I zipped two json files in coco one with rotated annotations and second with normal bboxes, I have also attached an image
data.zip