RSS Feed/News Font-awesome cache rebuild are not atomic, and not file-system full safe

[ENXF NET]

I've had a report from a client that a full-disk can cause XF's font-awesome sprite icons to become broken, and the lack of explicit rebuild CLI command (or rebuild tool under the admincp) makes recovering from this failure mode more difficult than it needs to be.

The issue appears to be the file is written without doing a write-to-new-file-and-rename thing to ensure it is atomic and if any failure occurs the system fails into a previous state instead of being broken

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