More work on Model:

- no more SolvedConfigurationStatus
- Reasons are strings.
- YodiiEngineResult fixes.
Merge remote-tracking branch 'origin/f-live-info' into f-yodii-commands

Conflicts:
	Yodii.Engine.Tests/ConfigurationSolverTests/ConfigurationSolver.Static.cs
LiveInfo with delayed events.
Refactored engine...
Merge branch 'f-yodii-commands' into feature/engine-integration

Conflicts:
	Yodii.Model/LiveModel/YodiiCommand.cs