Themes: Support applying components from multiple themes [1/3]

The current implementation assumes the components being passed
into the ThemeService belong to the same theme.  This patch uses
a Map instead of a List to pass in a mapping of components to
package names, allowing us to apply several components from
different themes.

Requesting a theme change now takes a Map<String, String> which
maps components to the theme package name they will be applied
from.
Example:
    Map<String, String> componentMap = new HashMap<String,String>();
    componentMap.add(ThemesColumns.MODIFIES_ICONS, "com.mytheme.blue");
    componentMap.add(ThemesColumns.MODIFIES_OVERLAYS, "com.mytheme.red");

    ThemeManager tm = (ThemeManager) contex.getSystemService(Context.THEME_SERVICE);
    tm.requestThemeChange(componentMap);

Change-Id: I13fa17eabecb824884fe522d5dc1822a4d7c55f4
Themes: Find wp asset when APK has dir entries

Some APKs are compiled with folders included as zip entries in the APK. This was causing
lockscreen wp to not correctly be set.

Change-Id: I9eca7878b29e3cfcb43abc4a9dab084d9c200b83
Make the "hidden battery" still appear in QS

While the hidden battery indicator mode implemented in the Settings
application should only hide the indicator in the status bar, it also
happens to hide it inside the QS tile for the battery which in turn
leaves an ugly UI. This commit provides a workaround by specifying
in which cases the indicator is being used for QS and providing a
special case for that.

Change-Id: Iede5dedfc90343d5b9f768aefc4a53b2aa56a1da