Workaround: changed default layout mode.

- Bug: Nothing is displayed when graph contains only one vertex.
- Bug: Crash when using layouts like EfficientSugiyama and Tree when using 2 or less vertices.
Added on-screen notifications.
Added detailed error messages for ConfigurationEditor. (...)

- Fixed animation layout for notifications.
- Restored partial save/load functionality (excludes ConfigurationManager entirely).
MainWindow: Commenting the bottom panel out while logs aren't used.
Merge branch 'feature/lab-bugfixes' into develop
Preparing for engine integration.
Merge remote-tracking branch 'origin/f-yodii-commands' into feature/lab-bugfixes
Adapting to current engine changes.
Merge branch 'f-yodii-commands' into feature/lab-bugfixes
Removed NuGet dependency: Extended.Wpf.Toolkit (...)

- Cleared some usings.
Lab: Notification layout fixes.
Lab: Changed denominations and removed redundant Properties. (...)

- LiveInfos become LabInfos. LiveInfos will be used inside those when the Engine is running.
- Removed redundant properties from LabInfos.
- Fixed notification title.
- ServiceInfoManager now binds to its own engine when starting and stopping.
- Adding/removing/reordering plugins and service when engine is running will cause the service manager to throw things in your face.
Lab VM: Notifications now bind to CollectionChanged instead of buttons.
Lab: Bug fixes. (...)

- Fixed lab tests to fit with new denomination and default loaded state.
- If a selected plugin/service is deleted from outside the VM, it will now be deselected.
- Removed IsLive property from ViewModel; use ViewModel.LabState.Engine.IsRunning instead.
- Added bool IsRunning to IYodiiEngine interface.
ConfigurationManagerTests: Bugfix. (...)

- Fix creation test, now that FinalConfiguration is no longer null on construction.
Merge branch 'feature/lab-bugfixes' into develop
Merge remote-tracking branch 'origin/f-yodii-commands' into feature/lab-bugfixes

Conflicts:
	Yodii.Model/IYodiiEngine.cs
StateManager: Bind to Engine.LiveInfo changes.
Enabled XML documentation. Enjoy your doc warnings! (...)

- Applies to both Debug and Release builds.
Yodii.Model: Full documentation pass.