OGLPlayer: set a timer which call redrawing to show animation

Change-Id: I7c98ba61be0510e9f86cb80fda73d18f7f7957cf
Collada2gltf: add -lrt to fix compilation problems

Change-Id: I1c0c9459cb716512dc726ee96fb811d03084aa62
OGLPlayer: fix playing of animation in edit mode

gltf_animation_set_time doesn't work but stops the animation.

Change-Id: Ia17724c36e2007451e24f97e04a09240359ad969