Assembly: Implement Bill Of Materials (#14198)

* Assembly: Implementation of BOM

* Assembly: BOM: make it possible for BOM to be made without an assembly.

src/Mod/Assembly/App/AppAssembly.cpp

@@ -28,6 +28,8 @@
 #include <Base/PyObjectBase.h>
 
 #include "AssemblyObject.h"
+#include "BomObject.h"
+#include "BomGroup.h"
 #include "JointGroup.h"
 #include "ViewGroup.h"
 
@@ -43,6 +45,7 @@ PyMOD_INIT_FUNC(AssemblyApp)
     // load dependent module
     try {
         Base::Interpreter().runString("import Part");
+        Base::Interpreter().runString("import Spreadsheet");
     }
     catch (const Base::Exception& e) {
         PyErr_SetString(PyExc_ImportError, e.what());
@@ -58,6 +61,9 @@ PyMOD_INIT_FUNC(AssemblyApp)
     // This function is responsible for adding inherited slots from a type's base class.
 
     Assembly::AssemblyObject ::init();
+    Assembly::BomObject ::init();
+
+    Assembly::BomGroup ::init();
     Assembly::JointGroup ::init();
     Assembly::ViewGroup ::init();