ROMControl: Remove Menu from UserInterface

Removes the "Menu>Reset Notification Wallpaper"
    Opt for an alertdialog + Preview instead
    If no wallpaper is present, open gallery
    as always.  Once image is picked/present
    display preview and remove/change dialog.

PS3: Clean-up/finish.
PS4: Final string edit...
    Decided I don't like "Change"
    in the option name since the
    option now allows removal as
    well as changing.

Change-Id: Ic25cac89ebe76d09a06401da38b0aa1f3f0e2fdc