OPNSense/core 93c40a5. plist, src/etc rc

rc: refactor /var handling, get MFS dirs from rc vars

This works regardless of enabled state, as long as the plugin is
installed the directories are transitioned (makes sense for temporary
disabling of services).

PR: https://forum.opnsense.org/index.php?topic=5987.0
DeltaFile
+150-0src/etc/rc.subr.d/var
+39-108src/etc/rc
+1-0plist
+190-1083 files

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