Ignore certain Tags for graph creation

Hi Aron,

I would like to ask, as you support Tag mask for creating navmesh from colliders if you could add Tag mask, which will be excluded from navmesh. For example, I would like to remove the doors from the navmesh and do not want to make a special layer just for doors. I can make it, but I would like to keep the original version, to feel freely to update it.