ROMControl: Remove Prefs Per Option State

Also clarified some strings.

PS2: Remove Notification Alpha if wallpaper isn't set
PS3: Formatting.
PS4: Reoganize GeneralUI; remove prefs based on DPI;
     hide clock options if clock is hidden
PS5: Fix whitespace
PS6: More Prefs
PS7: Dynamic prefs for Custom/Fav/Screenshot toggles
     Optimized rotation methods & set 270 enabled by default
PS8: Fix 2 preference removals in General UI

Change-Id: I21f77eaf123a8b7f1cb07c00bba71239cfe420e0