Add: now you can add any object to schedule
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Merge branch 'model' of https://github.com/Lozov-Petr/Schedule into Lozov-Petr-model

Conflicts:
	SEE/Editor/Editor.csproj
	SEE/Editor/Helpers/ExObservableCollection.cs
	SEE/Editor/Helpers/ObservableCollectionEx.cs
	SEE/ScheduleData/Helpers/ExObservableCollection.cs
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..
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Merge branch 'Lozov-Petr-model'
Changes after merge
Add: Export to Excel