Move core/scripts to build/scripts so that platform can use them.

Source/build/scripts/templates/StyleBuilderFunctions.h.tmpl

 {% from "macros.tmpl" import wrap_with_condition, license -%}
 {{ license() }}
 
 #ifndef StyleBuilderFunctions_h
 #define StyleBuilderFunctions_h
 
 #include "core/css/resolver/StyleBuilderCustom.h"
 
 namespace WebCore {
 
 class CSSValue;
 class StyleResolverState;
 
 class StyleBuilderFunctions {
 public:
 
 {%- for property_id, property in properties.items() if not property.use_handlers_for %}
 {% call wrap_with_condition(property.condition) %}
     static void applyInitial{{property_id}}(StyleResolverState&);
     static void applyInherit{{property_id}}(StyleResolverState&);
     static void applyValue{{property_id}}(StyleResolverState&, CSSValue*);
 {%- endcall %}
 {%- endfor %}
 
 };
 
 } // namespace WebCore
 
 #endif