Saldet

Added
- Inference entry point
- Saliency maps visualization utils

Changed
- InferenceDataset gives also image_path

<a id='changelog-0.4.0'></a>

Added
- Added PGnet Loss
- Added MultiBCE Loss
- Added train experiment entry point
- Added utils to train experiment
- Added pytorch_lightning datamodule

Fixed
- Correct casting between tensors in different computations


<a id='changelog-0.2.0'></a>

Added
- Added PGNet
- Added U2Net (lite + full)
- Added Saliency Dataset and Saliency Transform utils
- Added PyTorchLightning Module support to saliency models


<a id='changelog-0.1.0'></a>

Added
- Added I/O utils