Moved the abstract source editor to tooling base.

org.fortiss.tooling.base.ui/META-INF/MANIFEST.MF

...g.base.ui/src/org/fortiss/tooling/base/ui/editor/.ratings

...tooling/base/ui/editor/CustomUndoRedoForSourceEditor.java

.../org/fortiss/tooling/base/ui/editor/SourceEditorBase.java

...c/org/fortiss/tooling/base/ui/editor/annotations/.ratings

...s/tooling/base/ui/editor/annotations/AnnotationHover.java

...ng/base/ui/editor/annotations/AnnotationMarkerAccess.java

...s/tooling/base/ui/editor/annotations/ErrorAnnotation.java