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Decouple window pixmaps from scene windows

Vlad Zahorodnii requested to merge work/platform-surface-texture into master

One of the scene redesign goals is to make wayland surface items re-usable. So we have the same rendering path for drag-and-drop icons, software cursors, and window surfaces.

The biggest issue at the moment is that window pixmaps are tightly coupled with scene windows.

This change de-couples window pixmaps from scene windows. In order to achieve that, some architecture changes were made.

The WindowPixmap class was replaced with the SurfaceTexture class. A surface texture is created by a surface item.

Under the hood, a SurfaceTexture will create a PlatformSurfaceTexture object, which contains all the information necessary for the renderer.

The SceneOpenGLTexture class was removed. However, the GLX and the EGL on X11 backends still mess with GLTexture's internals.

cc #30

Edited by Vlad Zahorodnii

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