Support Z-projection overlays #1810
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Reduce the amount of code and iterate differently through the pixels. Despite using `double` for everything, this is about 10x faster on my machine. It may also use less memory, because pixel arrays do not need to be extracted for all z-slices.
Instead of collapsing an entire z-stack to 2D, this makes it possible to apply projections across adjacent slices (e.g. 2 slices above and below the current slice, so 5 slices in total).
Still rough... but now embeds options in a viewer
This reduces the risk of memory errors with large, untiled z-stacks (even if projections are slow).
Don't bind to pixel classification overlay - since we can already toggle with the projection buttons directly.
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Introduce new View → Show Z-project overlay toggle.
This adds support to visualise different z-projection overlays within a QuPath viewer whenever a z-stack is open.
Note that the performance isn't great with huge, untiled images... and hasn't been tested with whole slide z-stacks (since I didn't have one to hand). But it seems a useful feature to have when working with 'regular' confocal z-stacks.