Consider adding support for spaces polyline names

[veenstrajelmer]

When reading a polyfile (.pli) with these contents, I get an error since there are spaces in the names of the polylines:

DEEP BAY
     2     2
     113.892946      22.456477
     113.914459      22.416168
CHIWAN-NEILINGDING
     2     2
     113.808029      22.418575
     113.880432      22.459818
URMSTON ROAD
     2     2
     113.878906      22.380547
     113.911102      22.405981

It raises: "ValueError: Invalid formatted plifile, Settings of block might be incorrect, expected a valid name or description at line 0. Invalid block 0:4"

FM does support spaces in the names, it also includes all parts of the name in the history output, so not only the first part before the space like in obsfiles. However, when this polyfile is used for generating bc files, we would end up with names with spaces like this, which I think will cause issues for FM (not tested):

[Forcing]
name     = DEEP BAY_0001

I wonder if it is desireable to support spaces in polyline names, or not. If not, maybe FM should also not support them?

Edit: After a quick test I can conclude that FM does support spaces in bc forcing names, so I would suggest to add support for polyline names in hydrolib-core also if it does not ruin other processes.