support flipped/rotated tiles
As it is now they don't show up in M+.
that's a line for example with flipped/rotated tiles:
...0,230,1610612966,3221225702,2684354790,230,2684354790,3221225702,1610612966,232,1073742056,250,251,2147483899,2147483898,0,...
250=normal-->2147483898=flipped horizontally, 251=normal-->2147483898=flipped horizontally
232=normal-->1073742056=flipped vertically
230=normal-->2684354790=rotated 90°-->3221225702=rotated 180°-->1610612966=rotated 270° (rotated clockwise)
the doc is here: https://doc.mapeditor.org/en/stable/reference/tmx-map-format/#tile-flipping