Removing rendering backend

Removing rendering backend

Removed the rendering backend from dali-core, migrating the data providers,
render-frame-buffer.cpp, render-geometry.cpp, render-property-buffer.cpp,
render-texture.cpp, render-sampler.h, render-instruction-container.cpp,
render-instruction.cpp, render-item.cpp, render-list.h to Update.

Removed gl-abstraction.h, gl-sync-abstraction.h, gl-defines.h

Changed Core integration API to remove references to Context, GlAbstraction,
GlSyncAbstraction.

Removed render-renderer.cpp. Extracted StencilParameters struct to a new header
stencil-parameters.h

Moved performance-monitor.h to internal/common

Removed gl abstraction from test suite (not updating test cases in this patch)

Renamed render-frame-buffer.cpp, render-geometry.cpp, render-property-buffer.cpp,
render-texture.cpp, render-sampler.h to SceneGraph variants, tidied up UpdateManager.
Moved Event->Update messages to these objects from UpdateManager.

Removed shader saving feature from UpdateManager

Change-Id: I6844a8f615f629d093ca3066fcf52ec29a91748b
Signed-off-by: David Steele <david.steele@samsung.com>