Added new bitmap scaling and cropping. File picker now only looks for images
Merge pull request #155 from AlexKolpa/153-morph-tab-ui

Morphing tab ui
- Created the launch settings page
- Created the launch managers (already in earlier commit)
- Connected the functionalities
- Dialer now uses launch code and checks if the method is enabled
- App hiding is only done if another launch method was picked
- Widget is hidden from widget list if it is not enabled
- Widget can be temporarily shown on the home screen using the settings
- Refactored the VisibilityManager to account for hiding the widget
Merge branch 'master' of https://github.com/AlexKolpa/AndroidStealth into 160-launch-settings
- updated widget tap to hide text: smaller, centered
- enabling widget now does not cause a crash
- the launch settings page checks whether we could indeed disable the app icon