Peter M. Groen / dali-demo

Change-Id: I2cbd4814fbb3238c188a10900f98b5285da8dc98
Signed-off-by: György Straub <g.straub@partner.samsung.com>

With separate cameras for UI & 3D scene sections
 - Double-tap to toggle between 3D models (teapot & cube)
 - Pan up/down on left side of screen to change roughness
 - Pan up/down on right side of screen to change metalness
 - Pan anywhere else to rotate scene

Change-Id: I51ec8436700c4e970221184d6875e4e9c501fafb

Uses volumetric ray casting to draw a sphere with basic
per-pixel lighting inside the fragment shader.

Also modifies DALi demo make file to support shader files.

Change-Id: I0645de8481fa75abb177ca76a5611a51350fc1b7
Todo: Create a separate folder for shaders?