Support project templates using ${ProjectName} in project references.

Project template containing ${ProjectName} in the ProjectReference/@Include attribute will have the project name expanded.

<ProjectItems>
    <ProjectReference Include="..\${ProjectName}.Base.csproj" />

src/Main/Base/Project/Src/Internal/Templates/Project/ProjectDescriptor.cs

@@ -426,7 +426,7 @@ namespace ICSharpCode.SharpDevelop.Internal.Templates
 						ProjectItem newProjectItem = new UnknownProjectItem(
 							project,
 							StringParser.Parse(projectItem.ItemType.ItemName),
-							StringParser.Parse(projectItem.Include)
+							StringParser.Parse(projectItem.Include, new StringTagPair("ProjectName", projectCreateInformation.ProjectName))
 						);
 						foreach (string metadataName in projectItem.MetadataNames) {
 							string metadataValue = projectItem.GetMetadata(metadataName);