Default plugin creator now throws an exception when plugin ctor parameters cannot be resolved when starting. (...)

- Added relevant test.
- Note that an assertion now fails when setting the PluginCreator delegate on an engine that was stopped before, which is the case in the test.
- This is due to the CurrentError property not being cleared when  stopping the engine; it otherwise works as expected.
Removed Disabled status for Services.

A Service is started or stopped, publishing Disabled status for them requires to add to new list to Apply: list of disabled services and a list of not disabled ones.
Merge remote-tracking branch 'origin/develop' into f-host-reloaded

Removed dedicated exception type (using CKException instead).
Starting tests for Host.

Removed Host interfaces from Yodii.Model: moved hem to Yodii.Host assembly.
Work on the Host and tests.

New symmetric StartingSwapped/StoppingSwapped Service satus.
New ServiceCallsBlockedException to protect Ctor, PreStart and Stop methods.