* Fix in PositionChildLayout. * Added clipping for the button interior. * Renamed m_CompositionLayout to view_layout_ * Remove ComputeLayout2 * Remove ComputePosition2 * Renaming of signals in Button class * "clicked" signal became "click" * "changed" signal became "state_changed" * Replaced ComputeChildLayout with ComputeContentSize * Replaced PositionChildLayout with ComputeContentPosition * Replaced STATE_PRESSED with VISUAL_STATE_PRESSED * Replaced STATE_NORMAL with VISUAL_STATE_NORMAL * Replaced STATE_PRELIGHT with VISUAL_STATE_PRELIGHT * Replaced STATE_DISABLED with VISUAL_STATE_DISABLED