Core Rule Set: gitea's ordinary requests pass by default (closes #198)

The eighth change, internal/waf/gitea.conf, has the fields where gitea
sends a search, a file name or a branch name skip the rules that refused
ordinary gitea requests, on gitea's paths only. Referer skips 944130 too.
A registry's layer reuse skips 932260 on from, the seventh change.

The new setting SWWAF_CORE_RULE_SET_EXCLUSIONS_FILE loads an operator's
own exclusions before the Core Rule Set's rules. A set file that cannot
be read, does not parse or names smallwebwaf's own ids stops the start
in every mode.

A test sends the recorded gitea requests at the defaults, none refused,
and three attacks, all refused.

Model: opus-5-5

internal/waf/waf.go

@@ -273,8 +273,7 @@ func New(params Params) (*CoreRuleSet, error) {
 		}
 	}
 
-	text := fmt.Sprintf(directives, params.ParanoiaLevel, body, exclusions,
+	text := fmt.Sprintf(directives, params.ParanoiaLevel, body, exclusions, giteaExclusions)
-		giteaExclusions)
 
 	if len(params.DisabledRules) > 0 {
 		ids := make([]string, len(params.DisabledRules))