DataGridExtensions

• Fix #41: ApplyInitialSorting may cause exceptions

• Fix #35: DataGridFilterColumn doesn't work for combobox column

• Fix #23: Column virtualization is not supported

Fix #32: SelectAll() is not available when SelectionUnit="Cell"

• #29: Support default for ComboBoxColumns.

• Fix #27: Change notification for SourceValues when collection of item changes.
• Update Microsoft.Xaml.Behaviors.Wpf

• Fix #25: Missing resources in netcoreapp3.0 target
• Migrate System.Windows.Interactivity to Microsoft.Xaml.Behaviors
• Drop support for .Net < 4.5, add support for Net Core 3.0

Fix #16: exception clicking select all on a single select grid

Use embedded pdbs and license

• "SelectAll" button clears all filters if the data grid does not display any rows, because column headers can't be scrolled horizontally in this case. Now also works if column header style of dg was set already explicit

• "SelectAll" button clears all filters if the data grid does not display any rows, because column headers can't be scrolled horizontally in this case.
• Provide an explicit .net45 version to fix issues with referenced packages (System.Windows.Interactivity).

• Include ExternalAnnotations for R#

• #2: Provide an additional "SelectableValues" property, that holds all values not excluded by any other filter except the current column.