Add 'external annotations' path to JDK edit screen's list-of-jars and library node.
Update LibraryStandin
External Annotations node shows in JRE jar list UI.
Add 'external annotations' button to JDK edit dialog, and make it handle state changes like the others.
Extend all classpath related entities with an 'external annotations' path.
Finish classpath additions.
More classpath work
Fix booboo in assignment
Completed addition of external annotations setting
Update external annotations UI with Stephan's changes