feat(KeyboardShortcut): Add left and right arrow to cycle through images

[lchauvin]

Related to #610

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[PaulHax]

Works good. Thanks!

[floryst]

This does have an issue where not-yet reconstructed DICOM images aren't included in the cycling. I'm unifying the image list in #606, which should make this easier.

[lchauvin]

Has the list of images been unified ?

[PaulHax]

@lchauvin #606 added an imageCacheStore which holds image IDs for DICOM and other image types, even as they are loaded. So the arrow keys probably want to loop through the imageCacheStore.imageIds array.

[floryst]

I've given this some thought, so here are some ideas I had for this feature:

• the patient studies + images sidebar should have a backing store for it, which defines the order of the seen images. The order of the images in the image cache store might not be particularly useful, since the order still might not be what is visually seen in the sidebar
• The left/right arrow cycles will use this backing store to select the next image

[lchauvin]

Should I wait for the backing store before making any modification ?