Font-awesome cache rebuild are not atomic, and not file-system full safe

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Xon

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I've had a report from a client that a full-disk can cause XF's font-awesome sprite icons to become broken. An explicit rebuild CLI command would be nice, but the admincp tools rebuild option works.

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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