Clean up dependencies & remove OMERO support

This cleans up the dependencies, purging conflicting OME artifact
versions from the POM, which had been wreaking havoc at runtime.

It makes the necessary code adjustments to accommodate the fact that
OME Bio-Formats 5.0.1 artifacts are now brought in across the board.

Because ome-io and other OMERO artifacts are not available at
version 5.0.1, support for OMERO has been removed.
Organize imports
Apply code style template across the board
Eliminate unnecessarily nested else clauses
BrowserLauncher: ignore warnings

The code is forked from elsewhere, so we avoid gratuitous changes.
Fix lots of raw type warnings

Still many more left, but it's a start.