Update performance baselines

Set `maxRegression` to 1ms for all tests, as it turns out that both the
absolute and relative thresholds must be hit for a perf test to fail.

Update all baselines to the performance of current master. In most cases this
is faster than the previous baseline for Swift tests (often significantly
slow). A bunch of baselines were also previously missing entirely, and we had
some baselines for a target which doesn't even exist in the project any more.

The following tests had their baselines made slower:

Realm.testDeleteAll, Realm.testQueryDeletion, RealmSwift.testQueryDeletion:
These were made slower by adding more classes which link to the objects being
deleted, and basically all of the time is spent updating backlinks.

Realm.testRealmCreationCached, RealmSwift.testRealmCreationCached: Made slower
by the robust interprocess mutex change.

RealmSwift.testCountWhereTableView: Not sure why this is slower. Profiler says
~90% of the runtime is in the single call to `Query::find_all()`, so it's not
due to binding changes.

Some of the KVO tests were modified because it turned out that they were
actually mostly just benchmarking how long it takes to create an RLMArray,
which got slower due to the change to make LinkList destruction thread-safe.