Adapt to use the new integer type and to pass stricter overflow checks
#407
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This PR adapts the VerifiedSCION codebase to use the new
integertype in specifications when overflow checks are undesired and strengthens the specifications to ensure absence of overflows.This PR requires that PR viperproject/gobra#960 is merged first. In addition, this PR contains unnecessary type conversions and assumptions in some parts of the code that are no longer necessary but where in previous versions of the PR for overflow checks in Gobra. I will clean those annotations once viperproject/gobra#960 is merged.