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

Source/build/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