Issue #69: Implemented components disabling for activity diagrams and

src/main/java/avatartranslator/AvatarState.java

src/main/java/ui/AbstractCDElement.java

src/main/java/ui/ActivityDiagram2TMLTranslator.java

src/main/java/ui/AvatarDesignPanelTranslator.java

src/main/java/ui/CDElement.java

src/main/java/ui/CanBeDisabled.java

src/main/java/ui/ColorManager.java

src/main/java/ui/Expression.java

src/main/java/ui/FindNextEnabledConnectingPointVisitor.java

src/main/java/ui/ForwardComponentsEnabledVisitor.java

src/main/java/ui/GNCModeling.java

src/main/java/ui/GTMLModeling.java

src/main/java/ui/ICDElementVisitor.java

src/main/java/ui/MainGUI.java

src/main/java/ui/MalformedModelingException.java

src/main/java/ui/MalformedTMLDesignException.java

src/main/java/ui/RangeExpression.java

src/main/java/ui/TDiagramMouseManager.java

src/main/java/ui/TDiagramPanel.java

src/main/java/ui/TGCNote.java