Android Nougat Partial Screenshots

@MrWasdennnoch found out that Android Nougat (AOSP master branch, actually since 7.0) contains a commit named “Partial screenshot“ ( /6ca619fe1aff489e1227b0db6a77c96e973a1db3), which will seemingly allow us in the next Android version to select the size and position for taking a screenshot. By modifying line 53 of TakeScreenshotService ( /master/packages/SystemUI/src/com/android/systemui/scree