Update on requirement references

modeling/AVATAR/testReq.xml

modeling/SysMLSec/DSE_KDP.xml

src/main/java/ui/ActionPerformer.java

src/main/java/ui/TGComponentManager.java

src/main/java/ui/TGUIAction.java

src/main/java/ui/avatarrd/AvatarRDRequirement.java

src/main/java/ui/avatarrd/AvatarRDRequirementReference.java

src/main/java/ui/avatarrd/AvatarRDToolBar.java

src/main/java/ui/util/IconManager.java

src/main/java/ui/window/JDialogChoiceSelection.java

src/main/resources/ui/util/avatarrdreq.gif

src/main/resources/ui/util/avatarrdreqref.gif