Update to a recent bioformats_package.jar

[RainerHeintzmann]

I just ran into some trouble loading a file stored in a quite recent Zeiss .czi format. This caused some access error inside the bioformat_package.jar. Some investigate showed, that this can be fixed by installing a recent version of bioformats. The omx.xml has not changed, but this bioformat_package.jar now is Version 8.1.2 instead of 6.5.1

Unfortunately one needs to hack it in the local Julia folder, as the recommended addpath does not do the job in Windows without first removing the existing jar file.

Can we maybe just make a new release, with the Version line here changed to "8.1.0" ? This would be helpful and probably also update other formats.