Add "general settings" settings menu in Dialer

+ Add new fragment/preference screen xml for general settings.
+ Some settings are moved from Telephony's call settings. Logic in
the general settings fragment is mostl taken from the
CallFeaturesSetting PreferenceActivity..
+ Some settings are contact display options which have been moved
into this menu.
+ Moved DefaultRingtonePreference from Telephony.

Bug: 16788935
Change-Id: I28677bfdcb2cb17bce4981c01b6c03d4effa0a7e