display: fix blinking display issue with OpenGL 2.1

display: fix blinking display issue with OpenGL 2.1

Use the texture arrays to avoid collisions.

The glBufferSubData function makes the display blink
with OpenGL verion 2.1 have no glMapBufferRange support.
The glMapBuffer function helps to solve this problem.

Use the Qt5 class API(QOpenGLShaderProgram) instead of the OpenGL API.
That's a little clearer and better to watch.

Use multiple buffering to avoid performance degration.

Change-Id: I819a52f7e0db5accded86b71c8a15fa1a9e65e28
Signed-off-by: Jinhyung Jo <jinhyung.jo@samsung.com>
Signed-off-by: SeokYeon Hwang <syeon.hwang@samsung.com>