2 Fixes for Windows

1) Make sure the titlebar cannot be hidden/moved within a reserved area of the screen by the user (prevents the user from being able to re-select the window to move it out of the area again without using keyboard shortcuts)
2) Make sure that windows that are registered to the Desktop layer (or lower), or the Panel layer (or higher - except fullscreen) do not allow keyboard shortcuts if the window also does not have a frame/titlebar. This fixes situations where a DE using Fluxbox needs to make sure the desktop/panel windows are managed by fluxbox's layering system, but are not allowed to be closed/moved/modified with keyboard shortcuts because they are internally managed.