Allow adding AstTransforms to WholeProjectDecompiler

[Lombra]

I'm using the WholeProjectDecompiler and have some AstTransforms I would like to add, but this seems to be possible only when using CSharpDecompiler directly, unless I'm missing something.

[siegfriedpammer]

Using the latest master, you can now override the WholeProjectDecompiler.CreateDecompiler method in a derived class and add AstTransforms after the base-call:

class YourWholeProjectDecompiler : WholeProjectDecompiler
{
	protected override CSharpDecompiler CreateDecompiler(DecompilerTypeSystem ts)
	{
		var decompiler = base.CreateDecompiler(ts);
		decompiler.AstTransforms.Add(new YourCustomTransform());
		return decompiler;
	}
}