JBIDE-13389 bump feature/plugin versions to 4.5.200; use JBTIS target platform to resolve upstream dependencies; ensure org.jboss.tools.runtime.jbpm.detector.feature is on update site; add update site index.html page; point update site content.xml at upstream JBT Juno sites so when installing all deps can be found [4.1.0.Alpha1x branch]
JBIDE-13389 add missing files (forgot to add to previous commit) [backport from master branch to 41x]