JBIDE-15130 fallback to jdf.prestacks.client.repo and jdf.stacks.client.repo properties
JBIDE-15053 part 2, hiding unused widgets when manual download is required

JBIDE-15053 plus NPE
[JBIDE-14859] detecting aerogear and livereload via bundle (not feature)
JBIDE-14917 - uses stacksMessages interface to centralize logging