Adding first sketch of verification tracking structure

src/main/java/ui/MainGUI.java

...a/ui/verificationpd/VerificationPropertyDiagramPanel.java

...ui/verificationpd/VerificationPropertyDiagramToolbar.java

...n/java/ui/verificationpd/VerificationPropertyGeneric.java

...in/java/ui/verificationpd/VerificationPropertySafety.java

src/main/java/verification/Property.java