Upgrade H5Web to v16 (inc. v16.0.1)

[axelboc]

I had to remove an import of @h5web/app in the extension code, as it now refers to the navigator global, which is not defined in Node.

Relevant changes in v16 and v16.0.1:

• 🎉 Support JPEG decompression
• ⚠️ Remove support for SZ decompression (unmaintained)
• ✨ Support NeXus default_slice attribute — see /nexus_entry/default_slice in mock demo
• ✨ Always show all supported NeXus visualizations instead of only the one for the specified interpretation (e.g. both NX Line and NX Heatmap for 2D+ datasets)
• ✨ < NX Line > When auxiliary signals are present, show picker next to visualization tabs to allow showing/hiding any of the signals, including the main signal
• ✨ < NX Heatmap > Move signals picker to toolbar to match NX Line, as the new drop-down interface is better suited to dealing with a large number of auxiliary signals #1894
• ✨ < Line > Support piecewise constant interpolation
• ✨ < Line > Move Line/Points/Both control into new Aspect menu
• 🐛 < Line > Fix colors of auxiliary signals in dark mode
• 🐛 Fix wrapping of value buttons in attributes inspector
• < NX Line > Hide Errors toggle from toolbar completely (instead of disabling it) when there aren't any error values
• < Line > Never show Errors toggle at all in toolbar, since there can never be error values anyway
• < Matrix > Remove Freeze indices toggle from toolbar — row/column indices now always remain visible when scrolling
• Remember last known dimension mapping state for a specific visualization more often
• Use Opt instead of Alt in interactions help menu on Mac

NX Line signals picker

Piecewise constant interpolation

Aspect menu and new menu components in @h5web/lib