SceneTools: mark everything here as experiental.

To make people not rely too much on anything here -- I smell some API
changes incoming.

src/Magnum/SceneTools/FlattenMeshHierarchy.h

@@ -55,6 +55,9 @@ The operation is done in an @f$ \mathcal{O}(m + n) @f$ execution time and
 memory complexity, with @f$ m @f$ being size of the @ref Trade::SceneField::Mesh
 field and @f$ n @f$ being @ref Trade::SceneData::mappingBound(). The function
 calls @ref orderClusterParents() internally.
+
+@experimental
+
 @see @ref Trade::SceneData::hasField(), @ref Trade::SceneData::is2D(),
     @ref MeshTools::concatenate()
 */
@@ -64,6 +67,8 @@ MAGNUM_SCENETOOLS_EXPORT Containers::Array<Containers::Triple<UnsignedInt, Int,
 @m_since_latest
 
 Same as above with @p globalTransformation set to an identity matrix.
+
+@experimental
 */
 MAGNUM_SCENETOOLS_EXPORT Containers::Array<Containers::Triple<UnsignedInt, Int, Matrix3>> flattenMeshHierarchy2D(const Trade::SceneData& scene);
 
@@ -86,6 +91,9 @@ The operation is done in an @f$ \mathcal{O}(m + n) @f$ execution time and
 memory complexity, with @f$ m @f$ being size of the @ref Trade::SceneField::Mesh
 field and @f$ n @f$ being @ref Trade::SceneData::mappingBound(). The function
 calls @ref orderClusterParents() internally.
+
+@experimental
+
 @see @ref Trade::SceneData::hasField(), @ref Trade::SceneData::is3D(),
     @ref MeshTools::concatenate()
 */
@@ -95,6 +103,8 @@ MAGNUM_SCENETOOLS_EXPORT Containers::Array<Containers::Triple<UnsignedInt, Int,
 @m_since_latest
 
 Same as above with @p globalTransformation set to an identity matrix.
+
+@experimental
 */
 MAGNUM_SCENETOOLS_EXPORT Containers::Array<Containers::Triple<UnsignedInt, Int, Matrix4>> flattenMeshHierarchy3D(const Trade::SceneData& scene);
 

src/Magnum/SceneTools/OrderClusterParents.h

@@ -56,6 +56,9 @@ complexity, with @f$ n @f$ being @ref Trade::SceneData::mappingBound(). The
 @ref Trade::SceneField::Parent field is expected to be contained in the scene,
 having no cycles (i.e., every node listed just once) and not being sparse
 (i.e., every node listed in the field reachable from the root).
+
+@experimental
+
 @see @ref Trade::SceneData::hasField()
 */
 MAGNUM_SCENETOOLS_EXPORT Containers::Array<Containers::Pair<UnsignedInt, Int>> orderClusterParents(const Trade::SceneData& scene);
@@ -68,6 +71,9 @@ Like @ref orderClusterParents(), but puts the result into
 @p mappingDestination and @p parentDestination instead of allocating a new
 array. Expect that both views have a size equal to size of the
 @ref Trade::SceneField::Parent view in @p scene.
+
+@experimental
+
 @see @ref Trade::SceneData::fieldSize(SceneField) const
 */
 MAGNUM_SCENETOOLS_EXPORT void orderClusterParentsInto(const Trade::SceneData& scene, const Containers::StridedArrayView1D<UnsignedInt>& mappingDestination, const Containers::StridedArrayView1D<Int>& parentDestination);