Typos: user-facing and trivial

Several typos and uniformity fixes.
Note: 
*SCL/SimpleDataTypes.py is a upstream stepcode file whose fiz has been submitted upstream and accepted.
*the header of Tools/generateBase/generateMetaModel_Module.xsd  had redundant data. It has been removed. Please double check it.

src/Mod/PartDesign/App/FeatureLoft.cpp

@@ -139,7 +139,7 @@ App::DocumentObjectExecReturn *Loft::execute(void)
 
             mkTS.Build();
             if (!mkTS.IsDone())
-                return new App::DocumentObjectExecReturn("Loft could not be build");
+                return new App::DocumentObjectExecReturn("Loft could not be built");
             
             //build the shell use simulate to get the top and bottom wires in an easy way
             shells.push_back(mkTS.Shape());