Release v0.0.2

• added generic plugins that take user Python functions: from-pyfunc, pyfunc-filter, to-pyfunc
• added idc-exec tool that uses generator to produce variable/value pairs that are used to expand the provided pipeline template which then gets executed
• added polygon-simplifier filter for reducing number of points in polygons
• moved several geometry/image related functions from imgaug library into core library to avoid duplication
• added python-image-complete as dependency
• the ImageData class now uses the python-image-complete library to determine the file format rather than loading the image into memory in order to determine that
• the convert-image-format filter now correctly creates a new container with the converted image data
• the to-coco-od writer only allows sorting of categories when using predefined categories now
• the from-opex-od reader now handles absent meta-data correctly
• added the AnnotationsOnlyWriter mixin for writers that can skip the base image and just output the annotations