Combine Create and SetWidgetAttributes to one IPC.

Currently, we send an IPC to create the window, then an IPC call to
set the window type (i.e. Popup, FrameLess etc). This patch combines
them both into one Create IPC call.
IPC: No need to pass size information as part of SetWidgetState.

State Change handling in Display doesn't use the size information
being passed as part of WaylandWindow_State. WaylandWindow_State
doesn't accept size attributes anymore.