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

Source/core/scripts/templates/RuntimeEnabledFeatures.cpp.tmpl

-{% from "macros.tmpl" import wrap_with_condition, license -%}
-{{ license() }}
-
-#include "config.h"
-#include "RuntimeEnabledFeatures.h"
-
-namespace WebCore {
-
-{% for feature_set in feature_sets %}
-void RuntimeEnabledFeatures::set{{feature_set|capitalize}}FeaturesEnabled(bool enable)
-{
-{%- for feature in features if feature.status == feature_set %}
-    set{{feature.name}}Enabled(enable);
-{%- endfor %}
-}
-{% endfor %}
-
-{%- for feature in features if not feature.custom %}
-{%- call wrap_with_condition(feature.condition) %}
-bool RuntimeEnabledFeatures::is{{feature.name}}Enabled = false;
-{%- endcall %}
-{%- endfor %}
-
-} // namespace WebCore