Update to Bio-Formats 5.0.0 release

While the artifact organization was restructured, the API is unchanged.
Include Bio-Formats in external artifacts list

It was already being pulled in transitively from Stitching, but
really, we want Bio-Formats to be bundled with Fiji in any case.
POM: fix typo in artifact exclusion
gitignore: update ignore list for Bio-Formats 5
gitignore: update ignore list further

Aside from the changes for Bio-Formats 5, there were
also several other JARs missing from the ignore list.