(Suggestion) Make components generic to pasthrough datarow shape

[WAKayser]

Making the plot components generic on datarow can help with the accessors to check for existance on the data. Also it can for example be used in Pointer to give the correct data shape to the snippet. It will require a little bit of typescript wizardry, but it would make the usage of the accessors and functions easier.

[gka]

Yes, that would be amazing. To be honest, my TypeScript wizardry capabilities are somewhat limited, and you can see that throughout the codebase. I tried to use TS, but I never found the time to make all the checks pass. Being able to specify a DataRow type for a mark would be superb!

[gka]

I think I found a way to do this!