Lib restructure

[fstroth]

His PR refactors ross and ultralytics to the new structure.

[codecov[bot]]

Codecov Report

Merging #1120 (94dcc47) into master (ba6a714) will increase coverage by 0.06%. The diff coverage is 94.30%.

@@            Coverage Diff             @@
##           master    #1120      +/-   ##
==========================================
+ Coverage   85.48%   85.55%   +0.06%     
==========================================
  Files         305      293      -12     
  Lines        6675     6706      +31     
==========================================
+ Hits         5706     5737      +31     
  Misses        969      969              

Flag	Coverage Δ
unittests	85.55% <94.30%> (+0.06%)	:arrow_up:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...on/models/ross/efficientdet/backbones/backbones.py	100.00% <ø> (ø)
icevision/models/ross/efficientdet/lightning.py	36.66% <ø> (ø)
...n/models/ultralytics/yolov5/backbones/backbones.py	100.00% <ø> (ø)
icevision/models/ultralytics/yolov5/lightning.py	100.00% <ø> (ø)
icevision/models/ross/efficientdet/fastai.py	32.14% <35.71%> (ø)
.../models/fastai/unet/backbones/mobilenet_configs.py	100.00% <100.00%> (ø)
...ion/models/fastai/unet/backbones/resnet_configs.py	87.50% <100.00%> (+0.83%)	:arrow_up:
...ion/models/ross/efficientdet/backbones/__init__.py	100.00% <100.00%> (ø)
icevision/models/ross/efficientdet/show_batch.py	50.00% <100.00%> (+5.55%)	:arrow_up:
...vision/faster_rcnn/backbones/resnet_fpn_configs.py	88.00% <100.00%> (+5.14%)	:arrow_up:
... and 6 more

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