Bump to next development cycle

Signed-off-by: Jenkins <jenkins@dev.loci.wisc.edu>
Fix ImageJ1 managed artifact

The name should be "ij" not "imagej1".
Fix comment case
Manage more Bio-Formats artifacts
Update to Bio-Formats 5.0.1
Remove extra plugins repository

This repository is discouraged on Maven Central, and furthermore nearly
all the SciJava based projects do not need it. And if they do, they can
declare it themselves, of course; e.g.:

https://github.com/uw-loci/wiscscan-java/commit/9f0dcd4359fadba0e5afbd52cc2cf7e48f32410b#diff-600376dffeb79835ede4a0b285078036R132
Tweak whitespace
POM: add developer profiles for SNAPSHOT pinning

These handy profiles automatically update all version properties for
a given set of projects to SNAPSHOT versions rather than releases.

This makes it easier to develop multiple projects against one another,
although you must still be careful not to push changes to master which
rely on the SNAPSHOT coupling (otherwise the Jenkins build will fail).
pom.xml: add new property anchors

As there are now property tags in the profiles section, there is not a
good anchor point to restrict the search and replace range for scripts
like bump-pom-scijava.

This adds a unique comment at the start and end of the primary
properties section to distinguish it from profile properties.