Tweaked task extension tests.
Baseline for startup performance improvements. We're at least measuring how long it takes to create QueueReceivers now.
Bus building performance test. Nasty, nasty hack with lots of generated classes. Need to replace this with SRE shortly.
Made test async.
Replaced code-generated commands and handlers with SRE.
Adjusted timeout to allow for deleting lots of queues and topics.
Added competing and multicast event handlers to the bus startup tests.
Removed ConcurrentDictionary in favour of our own ThreadSafeDictionary.
Added server connection pooling.
Changed queue numbers and timeouts.
Merge branch 'StartupPerformance' of github.com:NimbusAPI/Nimbus

Conflicts:
	src/Nimbus/Infrastructure/RequestResponse/RequestResponseCorrelator.cs