Tagging Blender 3.0.0 Release

UPBGE: UPBGE 0.3 - version bump -> release

I want to express my appreciation to all the developers (present and
past), users, documenters and to all our internet friends who have made
this release possible. Thank you very much.

UPBGE: Fix crash with frustum culling disabled

Objects returned by CalculateVisibleMeshes must be "renderable"

It is fixing: UPBGE#1468

Tagging Blender [2.92.0] Release

Tagging Blender 2.83 release

UPBGE: Avoid to use Burley BSDF when roughness is connected

UPBGE: Last start.blend touches

UPBGE: Fix duplication of navigation mesh objects.

The duplication of navigation mesh was processing a regeneration of the mesh
and a registration to the scene in the function BuildNavMesh. But the caller
(ProcessReplica) is on an object without a scene graph node and so an access
to its scene, this mean that the try to register the nav mesh in the scene
obstacle simulation failed in BuildNavMesh because the scene is unreachable.

To fix this issue the management of obstacle simulation for nav mesh and
obstacles is fully moved into KX_Scene::AddNodeReplicaObject after the new
object ensure a scene graph node.

Fix issue UPBGE#926.

UPBGE: Set UPBGE version to 0.2.4.

Tagging blender release 2.79b