Where possible moved redundent C header includes from headers to source files

src/osgSim/ShapeAttribute.cpp

@@ -13,6 +13,7 @@
 
 #include <memory.h>
 #include <stdlib.h>
+#include <string.h>
 
 #include <osgSim/ShapeAttribute>
 
@@ -68,6 +69,13 @@ void ShapeAttribute::free()
     }
 }
 
+void ShapeAttribute::setValue(const char * value)
+{
+    free(); 
+    _type = STRING; 
+    _string = (value ? strdup(value) : 0);
+}
+
 void ShapeAttribute::copy(const ShapeAttribute& sa)
 {
     _name = sa._name;