Lab: Added icons for new file and engine toggle.
Removed IPluginInfo.PluginId property, using PluginFullName. (...)

- Tests fail.
Pending:
- Remove ID from mocks.
- Add trim sanity check on IsValid().
- Use IDiscoveredInfo.IsValid() in engine.
- XML doc update.
Merge remote-tracking branch 'origin/feature/plugin-guid-removal' into f-yodii-commands

Conflicts:
	Yodii.Lab.Tests/MainWindowViewModelTests.cs
InvalidOperationException in DynamicFinalDecision()