PRESIDECMS-2717 Permanent redirect to inline assets with a public URL

Permanent redirect can then be cached more agressively by proxies, etc. which
will save on traffic being processed by the application unnecessarily.

We still need a *temporary* redirect for assets like PDFs that are served
as attachments in order to first record download actions for users. We do
NOT want to do this for inline images in pages!

system/handlers/core/AssetDownload.cfc

@@ -121,7 +121,7 @@ component {
 				if ( !ReFindNoCase( "^/asset/", assetPublicUrl ) && event.getCurrentUrl() != UrlDecode( assetPublicUrl ) ) {
 					setNextEvent(
 						  url        = assetPublicUrl
-						, statusCode = "302"
+						, statusCode = type.serveAsAttachment ? 302 : 301
 					);
 				}