Add new BaseUrl->isLocalUri and BaseUrl->isLocalUrl methods

- Deprecate Util\Network->isLocalLink to reduce dependency on DI class

src/App/BaseURL.php

@@ -127,4 +127,14 @@ class BaseURL extends Uri implements UriInterface
 		$redirectTo = $this->__toString() . '/' . ltrim($toUrl, '/');
 		System::externalRedirect($redirectTo);
 	}
+
+	public function isLocalUrl(string $url): bool
+	{
+		return strpos(Strings::normaliseLink($url), Strings::normaliseLink((string)$this)) === 0;
+	}
+
+	public function isLocalUri(UriInterface $uri): bool
+	{
+		return $this->isLocalUrl((string)$uri);
+	}
 }