default void registerActionManifest( String actionManifestAbsolutePath, String startingActiveActionSet ){
        throw new UnsupportedOperationException("Action manifests are not supported for the currently used VR API");
    }
Registers an action manifest. An action manifest is a file that defines "actions" a player can make.
(An action is an abstract version of a button press). The action manifest may then also include references to
further files that define default mappings between those actions and physical buttons on the VR controllers.

Note that registering an actions manifest will deactivate legacy inputs. i.e. methods such as {@link #isButtonDown}
will no longer work

See https://github.com/ValveSoftware/openvr/wiki/Action-manifest for documentation on how to create an
action manifest

This option is only relevant to OpenVR

@param actionManifestAbsolutePath
         the absolute file path to an actions manifest
@param startingActiveActionSet
         the actions in the manifest are divided into action sets (groups) by their prefix (e.g. "/actions/main").
         These action sets can be turned off and on per frame. This argument sets the action set that will be
         active now. The active action sets can be later be changed by calling {@link #setActiveActionSet}.
         Note that at present only a single set at a time is supported
jme3-vr/src/main/java/com/jme3/input/vr/VRInputAPI.java