Format.Items and Format.HasNested getting out-of-sync

[imprima]

Format.Items and Format.HasNested can get out-of-sync.

The Parser sets HasNested correctly when adding a Placeholder:

SmartFormat/src/SmartFormat/Core/Parsing/Parser.cs

Lines 400 to 401 in cbb27ee

	_resultFormat.Items.Add(newPlaceholder);
	_resultFormat.HasNested = true;

However, HasNested will not change automatically in case a Placeholder is added or removed, e.g. in an extension.

Consequently this overload should marked as obsolete, as it also sets HasNested independently.

SmartFormat/src/SmartFormat/Core/Parsing/Format.cs

Lines 88 to 95 in cbb27ee

	public Format Initialize(SmartSettings smartSettings, string baseString, int startIndex, int endIndex, bool hasNested)
	{
	base.Initialize(smartSettings, null, baseString, startIndex, endIndex);
	ParentPlaceholder = null;
	HasNested = hasNested;
	return this;
	}