[2/2] Power connect/disconnect notification support

part 1/2: frameworks/base PowerUI and Settings
http://review.cyanogenmod.org/#/c/35241/

part 2/2: packages/apps/Settings Sound settings
http://review.cyanogenmod.org/#/c/35242/

patchset 3:
    set settings persistence and dependencies in xml resource file
    shrink long lines
    add the default notification tone to the ringtone picker and
        remove the now redundant "use default" checkbox
    move values/strings.xml content to the cyanogenmod section
    improve (mostly delete) wording in values/strings.xml
    remove tab whitespace

patchset 5:
    move strings to cm_strings

patchset 6:
    make vibrate optional (default on)
    change heading text: power notifications -> power sounds

patchset 7:
    hide vibrate option if hw capability doesn't exist

patchset 8:
    change vibrate to default to off

Change-Id: I7ddd8a47ae4f9a62c586023d151ac42bbe8424c7
PT-BR: Update translation

Change-Id: Ie8f274d8230def9548414ce4177a6e64d4c5e383
CMStats changes.
Remove the notification on boot. Users are thinking they need to opt out to get rid of the notification.
The setting to opt-out still exists in the Settings app.
If the user does not opt out within 'tFrame' time (1 day), the checkin service will now run; prior
to this, the checkin service would not run until the next reboot. That next reboot could occur within a
few minutes (startup crash, which then automatically checks in before the user has a chance to opt out)
or even the possibility of never. This is unpredictable and buggy.
Change the checkin frequency from 7 days to 1 day.

Change-Id: I66a26a6c200710146c0de3832253417fae557e52
Merge "PT-BR: Update translation" into cm-10.1
Merge remote-tracking branch 'upstream/cm-10.1' into cm-10.1