aeron-io#1: LibRsDef explicitly us crate:: to disambiguate from built in mods like bool
aeron-io#2: Added acting_version field to Composite structs to fix compilation errors when using Composite structs.  This is an incomplete implementation because the parent doesn't pass the acting_version to the composite because you need to change the signature of wrap(parent, offset) to include the acting_version, so this version just ensures that if the acting_version isn't set on the composite, it disregards the version check.
aeron-io#3: fixed primitiveArrayDecoder to return an empty array of the right size if less than version required.