Split xunit2.dll into xunit.core.dll (PCL) and xunit.execution.dll (Net45).
Stabilize sort order of failing test.
Remove ZIP steps from MSBuild (not planning to ship ZIP files any more).
Remove the last remnants of 'xunit2' in assembly names.
Make SourceInformation serializable (in addition to MBRO), because it's serialized in test cases.
#9910: Data driven tests showing long, not short result, in VS Test runner.
Fix parallelizing discovery bug that caused VS runner's 'Run All' to sometimes not run all.
Update XunitTestFramework and XunitTestFrameworkExecutor to dispose of our thread pool.