merging dev-v.0.2 branch

[christinab12]

Main changes in v.0.2. are:

• Use of Faster R-CNN model for object detection
• Pyramid model inference with a sliding window approach and tunable parameters for window size and window downsamplign rate
• Model confidence added as tunable parameter
• Allow to load and correct existing annotations (note: these must have been saved previously from v2 of this plugin)
• Object ID along with model confidence displayed in the viewer - this can now be related to box id in csv file of extracted features
• Fixed: box thickness changing at different donwsampling rates
• Possibility to work interactively with different shape layers at the same time, go back adjust parameters and switch between shape layers from layer list selection

Technical Extensions:

• Allows for Python 3.10