[PL/ST/Python] Cleanup includes and add fwd decls.

ProcessLib/SourceTerms/Python/PythonSourceTerm.cpp

@@ -13,6 +13,7 @@
 #include <iostream>
 
 #include "MeshLib/MeshSearch/NodeSearch.h"
+#include "NumLib/DOF/LocalToGlobalIndexMap.h"
 #include "ProcessLib/Utils/CreateLocalAssemblers.h"
 #include "ProcessLib/Utils/ProcessUtils.h"
 #include "PythonSourceTermLocalAssembler.h"

ProcessLib/SourceTerms/Python/PythonSourceTerm.h

@@ -9,12 +9,14 @@
 
 #pragma once
 
-#include "NumLib/DOF/LocalToGlobalIndexMap.h"
-#include "NumLib/IndexValueVector.h"
 #include "ProcessLib/SourceTerms/SourceTerm.h"
-
-#include "PythonSourceTermPythonSideInterface.h"
 #include "PythonSourceTermLocalAssemblerInterface.h"
+#include "PythonSourceTermPythonSideInterface.h"
+
+namespace ProcessLib
+{
+class LocalToGlobalIndexMap;
+}
 
 namespace ProcessLib
 {