Microviewer

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* refactor: make HyperVolume a child class of SegmentationVolume
* fix: painting was broken for rectangular images
* fix: automatically select a new port if 8080 in use

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* ui: add some help text to the save options
* ui: display memory usage
* fix: preload cursor images
* feat: add show unselected rendering mode to hyperview
* fix: ensure paint is selected so it doesn't disappear
* docs: be more specfic that saving is for segmentation
* feat: add --paint feature to images
* feat: enable saving segmentation for hyperview
* fix: disable spacebar zoom over 10x
* feat: add painting to hyperview
* fix: add appropriate mime types
* fix: ensure paint is treated correctly
* install: ensure libcrackle.wasm is included
* fix: crackle download
* fix: numpy download working
* fix: incorrect array size
* fix: save numpy
* fix: ensure header length set properly
* wip: broken but semi-functional crackle compression+save
* fix: NaN labels and prevent propagation of events when typing
* feat: add direct voxel painting
* feat: add save function to datacube

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* fix: more natural interaction with single point toggle
* feat: add drag selection and erase
* feat: adds paint function (but no UI support yet)
* fix: nicer error handling for CLI
* fix: decompress .ckl w/o .gz

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* chore: update ChangeLog, AUTHORS
* chore: upload cursor files
* docs: update history to mention eyewire
* docs+install: describe how to get all formats
* install: ensure cursor images are included
* docs: update screenshot
* feat: describe how to use the erase feature
* feat: add paint and erase functions
* fix: brush working more accurately
* improvements to brushes, move magnification indicator, open numpy files
* feat: brush cursor icons
* feat: large brushes
* feat: brush switching logic
* redesign: moving lots of info to a sidebar
* feat: visualize all segments and color the selected ones white
* fix: show that hover\_id is a class member in constructor
* fix: suppress broken pipe error from client closing window too fast
* fix: move instructions higher on the page
* feat: restrict size of selected segments box
* feat: decode crackle and compresso volumes
* feat: support loading memmaps

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* fix: better filenames in title

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* docs: note that nii is supported
* fix: hyperview working, supported in CLI
* feat: support NIFTI images if nibabel is installed
* feat: silence logging