Add option to disable automatic selection of related schemes

[lucacivale]

Is your feature request related to a problem? Please describe.

When we add a new schema, all referenced schemas are activated automatically. Since entities often refer to each other, many (unneeded) schemas are activated, and proxy classes created.
Since we are working with a huge endpoint, the size of our app would grow. Manually disabling all schemes that are unnecessary would be very tedious. We want to generate only the needed proxy classes.

Example:
Let's say we only want the select the 'FirstEntity'. In this case all three entites would be selected and the proxies created.

<EntityType Name="FirstEntity">
	<NavigationProperty Name="SecondEntity" Type="Collection(Microsoft.Dynamics.DataEntities.SecondEntity)" Partner="FirstEntity">
	</NavigationProperty>
</EntityType>

 <EntityType Name="SecondEntity">
	<NavigationProperty Name="FirstEntity" Type="Microsoft.Dynamics.DataEntities.FirstEntity" Partner="SecondEntity">
	</NavigationProperty>
</EntityType>

 <EntityType Name="ThirdEntity">
	<NavigationProperty Name="SecondEntity" Type="Microsoft.Dynamics.DataEntities.SecondEntity" Partner="ThirdEntity">
	</NavigationProperty>
</EntityType>

Describe the solution you'd like

Create an option to disable the automatic selection. If automatic selection is disabled exclude all properties with type EdmPropertyKind.Navigation.

SchemaTypes.xaml
<StackPanel Margin="0,5,0,5" Orientation="Horizontal">
	<CheckBox Width="16"
			  HorizontalAlignment="Left"
			  VerticalAlignment="Center"
			  Content="Show full name for schema types."
			  IsChecked="{Binding AutoSelectRelatedTypes}" />
	<TextBlock Margin="5,0,0,0" VerticalAlignment="Center">
		Automatically select related schemes.
	</TextBlock>
</StackPanel>

SchemaTypesViewModel.LoadSchemaTypes

IEnumerable<IEdmProperty> properties = AutoSelectRelatedTypes == true ? structuredType.DeclaredProperties
	: structuredType.DeclaredProperties.Where(property => property.PropertyKind != EdmPropertyKind.Navigation);

ODataT4CodeGenerator.WritePropertiesForSingleType

foreach (IEdmProperty property in properties.Where(i => i.PropertyKind == EdmPropertyKind.Navigation
    && context.ExcludedSchemaTypes.Contains(i.Type.Definition.AsElementType().FullTypeName()) == false))

ODataT4CodeGenerator.WritePropertiesForStructuredType
var propertyInfos = properties.Where(property => context.ExcludedSchemaTypes.Contains(property.Type.Definition.AsElementType().FullTypeName()) == false)

Don't know if this is the way to go but it worked for us.