To move the preference to the upper layer, we extract all logics
to its controller.
We move all tests to the test files and add server tests to
verify the behaviour of edit shortcut dialog.
Bug: 182992338
Test: atest MagnificationModePreferenceControllerTest
Change-Id: I34c4361e2e116a22c3e34bd35c8ac8cac752ab96
Provide a setting for new Magnify area feature and joystick controller
Bug: 146019459
Bug: 146473544
Test: make RunSettingsRoboTests ROBOTEST_FILTER=MagnificationModePreferenceControllerTest
Test: make RunSettingsRoboTests ROBOTEST_FILTER=MagnificationWindowControlPreferenceControllerTest
Test: make RunSettingsRoboTests2
Change-Id: Ia32fa073c59ad304e9ef9eb530ba37dd24c2f2f6