fine-tune layout + update icons

contrib/mobile/Android/AndroidManifest.xml

contrib/mobile/Android/res/drawable-hdpi/ic_launcher.png

contrib/mobile/Android/res/drawable-ldpi/ic_launcher.png

contrib/mobile/Android/res/drawable-mdpi/ic_launcher.png

contrib/mobile/Android/res/drawable-mdpi/icon_rotate.png

contrib/mobile/Android/res/drawable-mdpi/icon_translate.png

contrib/mobile/Android/res/layout/activity_fragment.xml

contrib/mobile/Android/res/layout/activity_model.xml

contrib/mobile/Android/res/layout/activity_twopane.xml

contrib/mobile/Android/res/layout/control_bar.xml

contrib/mobile/Android/res/layout/fragment_options.xml

...ib/mobile/Android/res/layout/fragment_options_display.xml

contrib/mobile/Android/res/layout/list_header.xml

contrib/mobile/Android/res/layout/splash.xml

contrib/mobile/Android/res/values/strings.xml

contrib/mobile/Android/res/values/styles.xml