Added option to disable web hooks

This mod introduces DISABLE_WEB_HOOKS parameter in [security] section
of app.ini (by default set to false). If set to true it disables web
hooks feature. Any existing undelivered web hook tasks will be cancelled.
Any existing web hook definitions will be left untouched in db but
its delivery tasks will be ignored.

Author-Change-Id: IB#1105130

modules/setting/setting.go

@@ -152,6 +152,7 @@ var (
 	MinPasswordLength                  int
 	ImportLocalPaths                   bool
 	DisableGitHooks                    bool
+	DisableWebHooks                    bool
 	OnlyAllowPushIfGiteaEnvironmentSet bool
 	PasswordComplexity                 []string
 	PasswordHashAlgo                   string
@@ -770,6 +771,7 @@ func NewContext() {
 	MinPasswordLength = sec.Key("MIN_PASSWORD_LENGTH").MustInt(6)
 	ImportLocalPaths = sec.Key("IMPORT_LOCAL_PATHS").MustBool(false)
 	DisableGitHooks = sec.Key("DISABLE_GIT_HOOKS").MustBool(true)
+	DisableWebHooks = sec.Key("DISABLE_WEB_HOOKS").MustBool(false)
 	OnlyAllowPushIfGiteaEnvironmentSet = sec.Key("ONLY_ALLOW_PUSH_IF_GITEA_ENVIRONMENT_SET").MustBool(true)
 	PasswordHashAlgo = sec.Key("PASSWORD_HASH_ALGO").MustString("argon2")
 	CSRFCookieHTTPOnly = sec.Key("CSRF_COOKIE_HTTP_ONLY").MustBool(true)