display: move display functionality to Qt5 GUI

display: move display functionality to Qt5 GUI

Qt5 GUI paints final display with all processing, not in VIGS.
The followings are in this commit.
 - VIGS: remove the code about display rendering
 - VIGS: modify the code about onscreen rendering server
 - VIGS: add functions to delivery the texture id to Qt5 UI
 - Qt5 UI: change the deprecated classes to the new classes
 - Qt5 UI: add OpenGL rendering functionality
 - Qt5 UI: fix the transparent issue with OpenGL
 - Qt5 UI: bug fix caused by image formats
 - etc. : minor modifications

Change-Id: I39471237b5d526751fac95e9fe88f05f6939142c
Signed-off-by: Jinhyung Jo <jinhyung.jo@samsung.com>