Optimisations - Fail early in appropriate matchers

[lawrencelomax]

In matchers for next values we can fail early

For example with haveIdenticalValues() for two signals:
1, 2, 3, 4, 5
1, 2, 5, 4, 5

we can fail when the events are known to be non-identical, i.e at index 2 of the values

[lawrencelomax]

Matchers should be stricter by default. Unit Tests should make assertions about the exact values a Signal will contain, as non-determinism is not a desirable trait of tests. This may be relevant to async matchers, but synchronous matching is based on the actual Signal having completed before the matcher even returns success or failure.

Closing as I can't see this being that important right now.