new form of contracts

....tooling.kernel.ui/trunk/icons/constraintErrorOverlay.png

...s.tooling.kernel.ui/trunk/icons/constraintFailOverlay.png

...oling.kernel.ui/trunk/icons/constraintOutdatedOverlay.png

org.fortiss.tooling.kernel.ui/trunk/plugin.xml

....tooling.kernel.ui/trunk/schema/constraintVerifierUI.exsd

...ss/tooling/kernel/ui/extension/IConstraintVerifierUI.java

.../tooling/kernel/ui/internal/ConstraintLabelDecorator.java

...g/kernel/ui/internal/ConstraintVerificationUIService.java

...g/kernel/ui/service/IConstraintVerificationUIService.java

.../org/fortiss/tooling/kernel/ui/util/ConstraintsUtils.java