Add options panel for columns (and rows?)

[thomcsmits]

Currently, one can move around columns, and delete single columns. However, this might not give enough flexibility to easily select which columns to show and in what order. A user might be interested in one cell type, and want to sort based on this. Simple auto sorting (as in #35 ) would not be enough for this.

If we add an options panel where someone cal select what cell types to show, and also add a sorting option (e.g. this could be a dropdown of all cells with selection option), then someone is able to do this more easily.

Could also be possible for rows, though we need to see if there is a use case for this.