Microviewer

-----

* fix: wrong dimension used in getSegsInCircle
* fix: refine cursor offset (large)
* feat: add destructivelyMergeSelection and destructivelyEraseSelection
* docs: show two more commands
* fix: don't hide segmentation during ctrl-shift-z
* feat: add left shift hide segmentation right shift hide channel
* feat: shift to hide segmentation in hyperview

-----

* fix: paint uint64 arrays
* fix: select segments on uint64 arrays

-----

* fix: brushes are circular on rectangular images
* fix: use pixelated image rendering in chrome

-----

* perf: faster color assignment and rendering

-----

* feat: adds invert selection
* docs: numpy format link
* docs: add feature highlights
* docs: update demo image

-----

* fix: undo/redo seemingly working now
* feat: add date to file names
* feat: adjust canvas dimensions on axis rotation
* feat: add controls info about ctrl+z and ctrl+shift+z (undo/redo)
* feat: not perfect, but partly working undo/redo function
* feat: add segment selection to undo
* feat: add undo for painting
* fix: insertSquare can handle more data types