Use bioformats reader as a fallback and allow more filetypes

[jstriebel]

Detailed Description

Affected library: webknossos

Currently, ds.add_layer_from_images() and Dataset.from_images() can use the pims bioformats reader when use_bioformats is explicitly set to true. It would be great to use the bioformats reader as a fallback and for unsupported datatypes anyways. We should check if the listed file suffixes should be monkey-patched to contain all possible ones (see also soft-matter/pims#357), or if a second try using the BioformatsReader directly is more appropriate.

[jstriebel]

Done via #829