public void disassociate() {
		DataTypeManager refDTM = refDt.getDataTypeManager();
		refDTM.disassociate(refDt);
	}
Disassociates this DataTypeSyncInfo's data type from its source archive.
Ghidra/Features/Base/src/main/java/ghidra/app/plugin/core/datamgr/DataTypeSyncInfo.java