selectable title
implement destroy method on widget
hide auto-layout toolbar buttons
do not handle ctrl+c and ctrl+v
add destroy method
bugfix: don't call method on undefined listener
introducing SplitPanel and enable 2 editor window on the screen
remove user-select-on clas deinition from panel-header-title
remove obsolete code
DiagramDesigner trigger UI activity on any user action that happend in the editor
initial clipboard support

- clipboard support with fake hidden textarea control (bcos of Firefox)
- add clipboard support for DiagramDesignerWidget (onCopy implemented,
onPaste missing)
- add clipboard support for ModelEditorPanel and ModelEditorControl
bugfix: message to the user if feature not available in browser
MetaEditorPanel supports itnerface ISupportClipboard

!!!! MetaEditorController still has no support for onCopy / onPaste
implement onPaste in ModelEditorControl

intellyPaste the nodes with the carried ID
error message fix
cleanup
inheritance is now handled inside core fully (and functioning as well)
don't enable create reference to itself while drag&drop
create reference mouse cursor icon
code cleanup