[addons] swap the section/setting control ID ranges

It's far more likely to have a limited number of categories than settings per category, particularly when some add-ons use a heap of boolean 'settings' for presenting basically static information.  e.g. see #15326

@ronie, @BigNoid, @Black09 do you know if any skins are relying on the settings or category buttons are in the current ranges (e.g. to do some fancy stuff with hidden controls or whatever?)