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Merge branch 'gui'
Reorganize classes
Create abstract ClassesTable class with type parameter
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Create abstract ClassesTable and its child GroupClasses
Serialize without ClassesTables.
Merge branch 'exp' of https://github.com/Lozov-Petr/Schedule into Lozov-Petr-exp

Conflicts:
	SEE/Editor/Repository/ScheduleRepository.cs
Comment import-export while not working
BugFix: classes table, classes initialization
Feature: Colored border of warning and conflict card
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Merge branch 'develop' of https://github.com/Alllex/Schedule into model
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Bugfix: correct work of coflict 'LecturersInDifferentClassrooms'.
Add new conflict: lecturers on different classes.
Merge pull request #12 from Lozov-Petr/model

New conflict.
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BugFix: serialization/deserialization.
Merge branch 'exp' of https://github.com/Alllex/Schedule into exp