Lazily read a subset of data from a folder of images using numpy slicing syntax. Includes simplified but robust file pattern matching syntax and multithreaded file reading. Note: this is not intended to promote a folder of tiffs as a useful way to store lots of information (things like hdf5/n5/klb are preferable). But for data that begins as a folder of tiffs, tifffolder simplifies the process of parsing that folder into data along different axes (and could be used as an intermediate step in the coversion to a better format if desired).