Eliminated all obvious errors; now the app starts up and shows a blank page.
Attempting to configure pom so m2e-apt will pick up the UF annotation processors
Uberfire now registers the system repo internally; apps must not do this anymore
UberFire now requires an ApplicationStarted event on the server once the app has started
Classes generated by annotation processors are now visible to dev mode.

Will try to simplify the project pom now; this checkin is just a safepoint.
This simpler pom still works for dev mode picking up APT-generated classes