Reorganize and clean up lock screen section

- Move the option for enabling widgets to the top of the widgets header,
  as it 1) is the most important option in that section, 2) is most
  likely going to be what the user is looking for first and 3) is a
  dependency for most of the other settings in that header.

- Use the simple and intuitive AOSP "enable widgets" title for enabling
  widgets instead of the verbose "widget pager" term.

- Make "maximize widgets" dependent on widgets being enabled.

- Shorten and simplify overly long, hard to parse space-hogging
  summaries.

- Move "slider shortcuts" out of the widgets section.

Change-Id: Iac1b55a6b976c5645ca7f46e7fdf0821396e1100

Conflicts:
	res/values/cm_strings.xml
	res/xml/lockscreen_interface_settings.xml
[WIP] Forward port Status Bar settings (2/2)

Signal / Clock / Notification Count / Brightness adjustment

Forward port from cm-10.2, adjusted for 4.4

Change-Id: I1632b6454a3fd5240179dfed34b1f332a7a37cda