Name log fields, metrics and the Core Rule Set package for what they are (closes #192)

Log field, metric, action and event names now say what they count
and, for timings, the unit. Package internal/waf is internal/coreruleset.

Model: opus-5-5

internal/config/config.go

@@ -336,7 +336,7 @@ const (
 	maxParanoiaLevel = 4
 	// firstSetupRuleID to lastSetupRuleID are the ids the Core Rule Set
 	// keeps for the rules that set it up, which sww's own rules
-	// have too (see internal/waf). Switching one off would undo a change
+	// have too (see internal/coreruleset). Switching one off would undo a change
 	// that no setting undoes.
 	firstSetupRuleID = 900000
 	lastSetupRuleID  = 900999
@@ -432,7 +432,7 @@ var (
 		"holds a control character, such as the carriage return of a Windows line end",
 	)
 	errNotAlertEvent = errors.New(
-		"is not ban, permanent_ban, waf_block, anomaly, reputation_hit, " +
+		"is not ban, permanent_ban, core_rule_set_match, anomaly, reputation_hit, " +
 			"source_failure or file_error")
 	errNotNumberOrOff = errors.New(
 		"is not a whole number above zero, such as 60, or off",