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As described on ticket, for some reason we still don't know, when
pfSense_kill_states() is called with subnet as parameter (n.n.n.n/n) it
makes changes on $_POST content that can lead system to unpredictable
results.

Add a workaround for the moment encoding variables when call this
function and also pfsense_kill_srcstates() while we don't figure out the
root cause of the problem.

Exclude from ARM, it's x86 only.

Save the last version of a valid set of rules under /cf/conf to make it
to persist on reboot.  This allow it to be loaded when, for some reason,
current ruleset is invalid.