[FYI] Try allotment instead of react-split-pane

[qaisjp]

I used react-split-pane in my earlier projects and it worked pretty well, albeit with a couple hacks and extra customisations for baseline functionality.

After spending a while getting a scrappy version of react-split-pane working in a new React application (and having to patch in types for React 18 #830), I managed to integrate allotment in 5m.

I highly recommend that people use allotment over react-split-pane for future projects, esp. since react-split-pane appears unmaintained.

Thank you tomkp for all your time and dedication so far building react-split-pane!