"max-blob-size" config var to limit generated HTML size

Sometimes it is not feasible to generate the HTML pretty-print for large
files, especially if a source-filter is involved or binary data is to be
displayed. The "max-blob-size" config var allows to disable HTML output
for blobs bigger than X KBytes. Plain downloads are not affected.

Signed-off-by: Georg Lukas <georg@op-co.de>

cgit.h

@@ -185,6 +185,7 @@ struct cgit_config {
 	int max_lock_attempts;
 	int max_msg_len;
 	int max_repodesc_len;
+	int max_blob_size;
 	int max_stats;
 	int nocache;
 	int noplainemail;