[CIPFILE] Instance 0xC8 shall treat EDS.gz same as EDS.txt

Currently, the File instance 0xC8 (EDS) can only recognize and load the EDS.txt file from the file system. According to the specification, EDS.gz is also a valid filename for instance 0xC8 and should be accepted as an associated file.

The .gz format is a compressed file format, offering the advantage of a smaller file size.

Furthermore, when both .txt and .gz formats are supported by instance 0xC8, the file format should be automatically determined based on the file extension.

Current behavior:

During the object initiation, the instance 0xC8 attribute 768 (LocalFileName) will be set to EDS.txt. When starting the File object, if the File object finds any files on the file-system that matching instances LocalFileNames, will set the instance attribute 1(state) to LOADED.  
With this approach, only one file name can be supported.

Solution:

Make the instance attribute 768 (LocalFileName) writable from Host. This way, Host is able to dynamically change the associated file on the file system.