Add notes about AnnotationHolder changes
Update upsource links per inspections
Fixes deprecation warning for AnnotationHolder
Compiles, but deprecation warnings for AbstractTreeBuilder, AbstractTreeUpdater, AnnotationHolder
- Replace documentation on writing components with documentation on migrating away from components
- Split documentation on extensions and extension points (extensions are always needed and EPs are quite uncommon)
- Add documentation on listeners
- Remove application and project components in sample plugins whenever possible