[PD] fix property issues

- Helix: the property Turns has the App::PropertyFloatConstraint thus also the pointer to it must have the same property

- LinearPattern and Helix: make constraints static class member (forgot this in commit 114bdf6b)

- Draft: make the constraint const

- PolarPattern and LinearPattern assure that the header file is loaded at last to avoid potential troubles

src/Mod/PartDesign/App/FeatureLinearPattern.h

@@ -66,6 +66,7 @@ public:
 
 protected:
     virtual void handleChangedPropertyType(Base::XMLReader& reader, const char* TypeName, App::Property* prop);
+    static const App::PropertyIntegerConstraint::Constraints intOccurrences;
 };
 
 } //namespace PartDesign