Mms: add MobilePaperShowActivity

This activity is from CAF, which allows incoming MMS messages which
appear as slide shows to be broken up into their separate images, while
still exposing the slideshow functinoality via an overflow menu button.

This helps alleviate the symptom of when an iPhone will send more than
one image in one MMS message and Mms app interpreting it as a slideshow
instead of separate images.

This commit is essentially a squash of:
https://www.codeaurora.org/cgit/quic/la/platform/packages/apps/Mms/log/src/com/android/mms/ui/MobilePaperShowActivity.java?h=LNX.LA.3.7.1&showmsg=1

Change-Id: I131a7b6203a071fc4adfc0efc80811a1e51aa995
(cherry picked from commit e06c06c62b1da6ced7b2c5ccf7163ac4e9bc4fae)

Conflicts:
	res/values/cr_strings.xml
Merge branch 'cm-11.0' of github.com:CyanogenMod/android_packages_apps_Mms into cm-11.0

(cherry picked from commit ae9affc79d3eaa518fc231f17018fa7511aeccbc)