InplaceUpdateRequirement

If 'inplaceUpdate' is true, then an implementation supporting this feature may permit tools to directly update files with 'writable: true' in 'InitialWorkDirRequirement'. That is, as an optimization, files may be destructively modified in place as opposed to copied and updated (see also: https://www.commonwl.org/v1.2/CommandLineTool.html#InplaceUpdateRequirement).