Redstone tracker added, split from TCListener, with fixes

Signed-off-by: Irmo van den Berge <bergerkiller@gmail.com>
Members and groups can now be parsed, moved mob spawner props

Signed-off-by: Irmo van den Berge <bergerkiller@gmail.com>
Further refined the properties system, now allows commands to change props

Signed-off-by: Irmo van den Berge <bergerkiller@gmail.com>