subroom convert to polygon bug
Refer https://cst.version.fz-juelich.de/jupedsim/jpscore/commit/a0eeb6fd6c3b29309c2e651b6f1935e900426f39
Walls smaller than 3cm are not considered to be a part of the polygon, hence the polygon creation is discarded.
Exit doors overlapping with the Walls stay hidden. The polygon created for the subroom does not recognize this overlap of wall over the exit.