Image-dataset-converter-imgaug

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- fixed `idc.imgaug.filter.transfer_region` method: image segmentation layers now use values (0,255)
- using underscores now instead of dashes in dependencies (`setup.py`)
- renamed `idc.imgaug.filter._sub_images_utils.process_image` to `extract_regions`
- added `crop-to-label` filter that crops the image to the bbox of the annotation with the specified label
- the `sub-images` and `meta-sub-images` filter now have options to generate a regions via predefined number
of rows/cols or row height/col width on the fly, useful when dealing with images of differing dimensions
(and the regions parameter is now optional)

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- added support for placeholders: `idc-combine-sub-images`

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- `idc-generate-regions` tool can take margins and overlaps (right/bottom) into account for its region calculations now
- `idc-combine-sub-images` tool now has more details in the exceptions when extraction of groups fail
and prunes the annotation after the merge as well
- `meta-sub-images` now outputs a logging message if there are no annotations after transferring
regions/pruning annotations
- method `transfer_region` now adds the sub-images rather than replacing the tile in the overall layer,
to allow for overlaps (for reducing edge effects)

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- requiring image_dataset_converter>=0.0.5 now

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- switched to underscores in project name
- switched to new methods from idc.api: `empty_image(...)` and `array_to_image(...)`

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- switched from unmaintained imgaug to imgaug3 library (https://github.com/nsetzer/imgaug)