add play/explore method to interactively view 3d image or framestack

[johnnychen94]

Rework JuliaImages/ImageInTerminal.jl#43, I've removed the codes related to terminal rendering in this PR to adapt vscode/atom display, I'd prefer to pend the terminal rendering functionality until this is done.

In short words, play method provides an interactive alternative to gif view.

Hopefully, we could make this implementation the default Base.show method for 3d image. I'm not sure of it, so I didn't export the name play yet.

Feedback, review, and any kind of features suggestions are welcome.

preview:

Unlike the original PR, play method here supports framestack of different image sizes (see the second demo gif).

cc: @IanButterworth

[codecov]

Codecov Report

Merging #29 (aa9e03c) into master (4f7129e) will decrease coverage by 5.50%.
The diff coverage is 82.56%.

❗ Current head aa9e03c differs from pull request most recent head 91d1bc5. Consider uploading reports for the commit 91d1bc5 to get more accurate results

@@            Coverage Diff             @@
##           master      #29      +/-   ##
==========================================
- Coverage   93.51%   88.01%   -5.51%     
==========================================
  Files           4        6       +2     
  Lines         108      217     +109     
==========================================
+ Hits          101      191      +90     
- Misses          7       26      +19     

Impacted Files	Coverage Δ
src/ImageShow.jl	40.00% <ø> (ø)
src/compat.jl	33.33% <0.00%> (-16.67%)	⬇️
src/keyboard.jl	79.16% <79.16%> (ø)
src/multipage.jl	86.66% <86.66%> (ø)

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[johnnychen94]

For the coverage report:

• play and explore are very thin wrappers of the internal _play methods
• error handling

Manually using them locally seems pretty nice. So I'll say this PR is ready, I'll update the README and then merge it.

[IanButterworth]

I just noticed that in the example gifs, vscode appears to be creating a new plot per frame? Does it retain the old plots? That would be bad for memory usage

[johnnychen94]

Does it retain the old plots? That would be bad for memory usage

Unfortunately yes, I can't find a way to refresh on the same plot. Do you have any ideas? (I use display to do this)

[johnnychen94]

This PR is growing bigger so I still decide to merge it. I've marked them as experimental features and we can fix the left issues(#33 #34) in the future.