[Tizen] Backport 7.5 Scene3D for use ModelNode

[Tizen] Backport 7.5 Scene3D for use ModelNode

This is a combination of 10 commits.

Make sure that global variables are initialized lazily in scene3d.

Fix coverity issue (no POSITION attribute + use after move)

Signed-off-by: Eunki, Hong <eunkiki.hong@samsung.com>
Change namings of gltf-util

Signed-off-by: seungho baek <sbsh.baek@samsung.com>
Remove Duplicated code in gltf2-util using template

Signed-off-by: seungho baek <sbsh.baek@samsung.com>
Enable automated tests that load the exercise DLI model

Replace std::string global variables with C-style string.

A std::string global variable would allocate a memory in heap,
then copy the string from .text section to the heap.
This patch may reduce loading time & memory a little.

Use ModelNode / ModelPrimitive / Material instead of Actor / Renderer

 - This patch is based on the previous patch
	https://review.tizen.org/gerrit/#/c/platform/core/uifw/dali-toolkit/+/288075/

Signed-off-by: seungho baek <sbsh.baek@samsung.com>
Fix svace/coverity issue (initialize value at Material)

Signed-off-by: Eunki, Hong <eunkiki.hong@samsung.com>
Change public member variable to private

Signed-off-by: seungho baek <sbsh.baek@samsung.com>
Allow to use premultiplied external texture

FrameBuffer result colortexture is premultiplied always.
So make we always use premultiplied texture.

And make a way to user determine native image source is premultiplied or not.

+

Since FBO texture always premultiplied, revert scene view's trick
https://review.tizen.org/gerrit/c/platform/core/uifw/dali-toolkit/+/285486

Change-Id: Idfec7ea5a26dcc827953ce268c32adc8f89247bd
Signed-off-by: Eunki Hong <eunkiki.hong@samsung.com>