allow Design.plate_maps parameter well_marker to be function of well position #222
Description
Currently well_marker is a constant string. Allow it also to be a function taking the well position as input as a string (e.g., "A1" or "C7"), and returning a string to put in that position. For example giving the identity function would put the well position itself:
import scadnano as sc
helices = [sc.Helix(max_offset=100)]
design = sc.Design(helices=helices, strands=[], grid=sc.square)
design.draw_strand(0, 0).move(10).with_name('strand 0').with_idt(plate='plate 1', well='A1')
design.draw_strand(0, 30).move(10).with_name('strand 1').with_idt(plate='plate 1', well='B3')
plate_maps = design.plate_maps_markdown(well_marker=lambda well: well, strands=[design.strands[0], design.strands[3]])
plate_map = plate_maps['plate 1']
print(plate_map)would print
## plate 1
| | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 |
|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|------|------|------|
| A | A1 | | | | | | | | | | | |
| B | | | B3 | | | | | | | | | |
| C | | | | | | | | | | | | |
| D | | | | | | | | | | | | |
| E | | | | | | | | | | | | |
| F | | | | | | | | | | | | |
| G | | | | | | | | | | | | |
| H | | | | | | | | | | | | |