feat: Keyboard shortcut to delete current image and clear scene

[lchauvin]

Add a keyboard shortcut to delete the current image (ctrl+d), and clear the whole scene (ctrl+w)

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[PaulHax]

Looks good! Gracias.

[floryst]

Whatever your final keybinds are, please add them to https://github.com/Kitware/VolView/blob/main/docs/mouse_controls.md.

[lchauvin]

Whatever your final keybinds are, please add them to https://github.com/Kitware/VolView/blob/main/docs/mouse_controls.md.

I changed the shortcut to add modifier, and modified mouse_controls.md

[floryst]

I'm all for updating datasetStore.remove so that we can pass in null image IDs without checking. That way we can drop the ! operator here.

remove(id: string | null) {
if (!id) return
...
}

[lchauvin]

I added the changes

[PaulHax]

I was trying to squash some of lchauvin's commits and rebase rather than merge on main... but messed up force pushing them back on this PR =/

Guess we just use #713