Add support for remote files

[davenice]

The CICS tree currently represents local files (the LOCFILE table), however CPSM also presents remote files (REMFILE).

From a CICS developer perspective, they just write to a file - they don't know whether it's local or remote - so I think it makes sense to show these both within a Files element in the tree.

Similar approach to TS Queue #415

[github-actions]

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