@Override
	protected PcodeUseropLibrary<Pair<byte[], U>> createThreadStubLibrary() {
		return getPartsFactory().createLocalUseropStub(this);
	}
Get the factory that manufactures parts for this emulator

@implNote This should just return a singleton, since it is called repeatedly (without
          caching) during emulator and thread construction. If, for some reason, a singleton
          is not suitable, then this should instantiate it just once and cache the factory
          itself. If cached, it should be done in a thread-safe manner.

@return the factory
Ghidra/Framework/Emulation/src/main/java/ghidra/pcode/emu/auxiliary/AuxPcodeEmulator.java