Слияние с diagnostics

Закрыть ветку diagnostics

working version of diagnostics logging

improved log concept

initial log capabilities

fixed race condition in DispatchPool

removed the reference to the parent from the promise object this allows resolved promises to release parents and results they are holding. Added complete set of operations to IPromiseBase interface Subscribing to the cancellation event of the promise should not affect it's IsExclusive property More tests.

fixed: StackOverflow in IPromiseBase.Then(handler) fixed: hang in ChainMap method on empty arrays

minor cleanup

small refactoring, cleanup.