Converted the instances of const built in types being returned from methods

and passed as paramters into straight forward non const built in types,
i.e. const bool foogbar(const int) becomes bool foobar(int).

include/osg/StateAttribute

@@ -29,7 +29,7 @@ class StateSet;
         virtual bool isSameKindAs(const osg::Object* obj) const { return dynamic_cast<const name *>(obj)!=NULL; } \
         virtual const char* libraryName() const { return #library; } \
         virtual const char* className() const { return #name; } \
-        virtual const Type getType() const { return type; }
+        virtual Type getType() const { return type; }
 
 /** COMPARE_StateAttribute_Types macro is a helper for implementing the StatateAtribute::compare(..) method.*/
 #define COMPARE_StateAttribute_Types(TYPE,rhs_attribute) \
@@ -178,7 +178,7 @@ class SG_EXPORT StateAttribute : public Object
         virtual const char* className() const { return "StateAttribute"; }
         
         /** return the Type identifier of the attribute's class type.*/
-        virtual const Type getType() const = 0;
+        virtual Type getType() const = 0;
 
         /** return true if StateAttribute is a type which controls texturing and needs to be issued w.r.t to specific texture unit.*/
         virtual bool isTextureAttribute() const { return false; }