Added eclipse support for exec plugin

Because of Eclipse's weird lifecycle mappings, the M2Eclipse plugin
doesn't know how to handle maven-exec:exec targets by default.

The M2E pluginManagement attribute was specifically designed to handle
situations like this, so the ome-xml and scifio component poms are now
updated to instruct M2E how to run maven-exec:exec.

To reduce overhead, exec will not run on incremental builds, so a full
clean & build is required to re-generate the xsd-fu sources.
merge develop -D org -I include -E exclude: PR 433 (More .nd2 fixes (rebased onto develop))
merge develop -D org -I include -E exclude: PR 465 (Kryo memoizer)
merge develop -D org -I include -E exclude: PR 467 (Revert "Adding Transform to Image, see #3742")
merge develop -D org -I include -E exclude: PR 474 (Fix broken anchors in Sphinx metadata pages (rebased onto develop))
merge develop -D org -I include -E exclude: PR 476 (ZVI ROI fixes (develop))
merge develop -D org -I include -E exclude: PR 480 (Added eclipse support for maven-exec:exec plugin)