consider whether NICHESv2 should depend on seurat at all...

[diegospa99]

from sam on slack: "Major questions include a) should NICHES2.0 be dependent on Seurat at all? and if not, how do we best make independent so that it still works with Seurat fluidly?"

[RaredonLab]

I think that we should build a helper function to extract data from Seurat (or other) and formats it automatically for work within NICHES. Then also a helper function that extracts data from NICHES for import into Seurat (or other). Matrix or dataframe intermediaries.