Ij insight fixed develop

To test:
 * Add insigh-ij plugins to plugins folder
 * Add either loci_tools.jar or bioformats_package.jar to the plugins directory.
 * A warning should be displayed if none present.

Check that 
 * No B-F associated jar and logback under insight-ij/libs directory.

--rebased-from #2074 and --rebased-from #2119