Replace the existing input event handler in tests with 'InputEventHandlerSlot'
Replace the existing input event handler in tests with 'InputEventHandlerSlot'

--HG--
branch : gui_navigation-devel

cbeck88/cegui-mirror-two,cbeck88/cegui-mirror-two,cbeck88/cegui-mirror-two,cbeck88/cegui-mirror-two,cbeck88/cegui-mirror-two