Add Entity Framework SQL Server Compact package.
Add TrackedTask class.
Add Path property to TrackedTask class.
Add TrackerContext class.
Change solution configuration to Any CPU.
Make new classes public.
Remove old databinding code; bind to TrackedTask object, add DataGrid to MainWindow.
Add code to events to load and save data.
Remove public modifier from Task and Context classes.
Mark TaskId property as primary key.
Merge branch 'feature/database-setup' into develop