* contracts-bedrock: Fix enforcement of delay on DelayedVetoable

Prior to this change, a bug existed in the DelayedVetoable contract,
which resulted in anyone being able to execute a transaction as soon as
it had been initiated.

A factor in this was an edge case behavior in foundry's vm.expectRevert
which flips the success value of a low level call. This commit also
introduces a new convention when expectRevert is used on low level calls
to make this edge case behavior more evident.

* contracts-bedrock: Add revertsAsExpected to Style Guide

* contracts: Fix compiler warnings

* bindings and semver