List rejected calls separately (1/3)

This makes a new category of "Rejected Calls"
Thus from earlier categories
INCOMING, OUTGOING, MISSED, VOICEMAIL
we now have
INCOMING, OUTGOING, MISSED, VOICEMAIL, REJECTED

in call log, we can see rejected calls like the other
categories

supporting patches in
frameworks/base : to initialize REJECTED_TYPE integer
packages/apps/Phone : to list rejected calls as REJECTED_TYPE
                      when they are rejected from ringer screen

Also included listing of rejected calls in statistics

Originally author: Arnav Gupta (championswimmer)
Backported from AOKP JB-MR1 by: Daveee10