Swin V2 CR impl refactor.

* reformat and change some naming so closer to existing timm vision transformers
* remove typing that wasn't adding clarity (or causing torchscript issues)
* support non-square windows
* auto window size adjust from image size
* post-norm + main-branch no

timm/models/__init__.py

@@ -38,6 +38,7 @@ from .selecsls import *
 from .senet import *
 from .sknet import *
 from .swin_transformer import *
+from .swin_transformer_v2_cr import *
 from .tnt import *
 from .tresnet import *
 from .twins import *