Wrap all ViewEngines in a profiler

Wrap all ViewEngines in a custom profiler view engine, using the
ProfilerResolver to track performance
Make sure the profilingengine doesn't wrap itself
Merge pull request #146 from mortenbock/6.2.0

Custom ProfilingViewEngine
Merge remote-tracking branch 'origin/6.2.0' into 7.0.0

Conflicts:
	src/Umbraco.Web/WebBootManager.cs