Imagedata

* Viewer: Key press 'w' will normalize window level/width to displayed slice
using a histogram normalization.
* Viewer: Key press 'h' will toggle display of text on display.
* Viewer: Display demographic and acquisition info in upper right and level corners.
Changed
* Support Python 3.12

Added
* Viewer: Display seriesDescription upper right.

Fixed
* Protected Series and Header objects for missing properties.

Fixed
* Fixed signed integer overflow in DICOMPlugin.write_slice().

Changed
* Major modification to Series class, removing the DicomHeaderDict attribute.

Fixed
* Header: When using a template to create DicomHeaderDict, use deepcopy to get a unique
DicomHeaderDict for the new instance.
Added
* Viewer: Save window center/width to Series object when returning.
* Series.fuse_mask(): New parameter `blend` which determines whether
the self image is blended. Default is False, such that the self image is
not blended, only the mask is blended.