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/observe_test.go

@@ -149,10 +149,10 @@ func TestObserveModeForwardsWhatEnforceModeRefuses(t *testing.T) {
 
 			geojsURL, _ := startGeoJS(t)
 			env := map[string]string{
-				lookupTimeout:      "1h",
-				rateLimitPerMinute: "1",
-				denyNets:           denied,
-				tagDeny:            denyKP,
+				asnAndCountryLookupTimeout: "3600000",
+				rateLimitPerMinute:         "1",
+				denyNets:                   denied,
+				tagDeny:                    denyKP,
 			}
 
 			if tc.setting != "" {