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/waf/history_test.go

@@ -18,9 +18,9 @@ func TestHistoryKeepsEachRequestOfTheClient(t *testing.T) {
 
 	geojsURL, _ := startGeoJS(t)
 	s, clk, server := startWithClock(t, geojsURL, map[string]string{
-		lookupTimeout:      "1h",
-		rateLimitPerMinute: "2",
-		tagDeny:            denyKP,
+		asnAndCountryLookupTimeout: "3600000",
+		rateLimitPerMinute:         "2",
+		tagDeny:                    denyKP,
 	})
 	start := clk.Now()