message: add back CreateVolumeStreamingBehavior custom controls
diff: import { StateTransformParameters } from '../mol-plugin-ui/state/common';
  +import { CreateVolumeStreamingBehavior } from '../mol-plugin/behavior/dynamic/volume-streaming/transformers';
  import { DefaultPluginSpec, PluginSpec } from '../mol-plugin/spec';
  import { StateAction, StateTransformer } from '../mol-state';
  +import { VolumeStreamingCustomControls } from './custom/volume';
  export { PluginUISpec };
  @@ -37,4 +39,7 @@ namespace PluginUISpec {
  export const DefaultPluginUISpec = (): PluginUISpec => ({
  ...DefaultPluginSpec(),
  + customParamEditors: [
  + [CreateVolumeStreamingBehavior, VolumeStreamingCustomControls]
  + ],
  });
  \ No newline at end of file
  