UML14 — Guard in current metamodel can be replaced by Constraint with stereotype

Summary: The Guard metatype in the current metamodel contains only one attribute
of type BooleanExpression. Since a guard is semantically equivalent to
a Constraint on the transition, we can remove the Guard metaclass and
add e standard stereotype <<guard>> for Constraints, with the same
semantics.

It simplifies the metamodel by unifying the Guard and Constraint concepts.
It also allows OCL as the optional language to write the guard expression.

Within the OCL specification, it should be checked if there are any
additions that need to be made to support everything neded to express
udseful guards.

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