Rename the settings whose names do not say what they control (closes #234)

Applies the setting renames of the naming audit under the SWW_WAF_ and
SWW_RPROXY_ prefixes, with sneak's names for the IP reputation cache
time and the two time limits, which now take milliseconds. The rproxy
log field default_disposition becomes waf_backend_no_answer, and
config.Config and config.FromEnvironment become config.WAF and
config.WAFFromEnvironment. Go fields, test names and prose follow. No
aliases; nothing reads the old names.

Model: opus-5-5

internal/anomaly/anomaly_test.go

@@ -26,7 +26,7 @@ func TestEachScopeHasACooldownOfItsOwn(t *testing.T) {
 	overAtTheSecond := anomaly.Thresholds{RequestsPerMinute: 1}
 	counters := anomaly.New(anomaly.Params{
 		Client: overAtTheSecond, Net: overAtTheSecond, ASN: overAtTheSecond,
-		Total: overAtTheSecond, Watch: overAtTheSecond,
+		Total: overAtTheSecond, WatchedNet: overAtTheSecond,
 		// The netblock around a client is the client's own, and two names
 		// name one netblock.
 		NetV4Prefix: 32,