In what configure file(s) in the source code CyanogenMod 12.1 stores global (not overlay) default values of “Mobile data” and “Data roaming” settings?
In the CyanogenMod/android_frameworks_base/packages/SettingsProvider/res/values/customize.xml
file:
<!-- Default for Settings.Global.DATA_ROAMING -->
<bool name="def_enable_data_roaming">false</bool>
<!-- Default for Settings.Global.MOBILE_DATA -->
<bool name="def_enable_mobile_data">true</bool>