Add struct cgit_page to cgit_context

This struct is used when generating http headers, and as such is another
small step towards the goal of the whole cleanup series; to invoke each
page/view function with a function pointer.

Signed-off-by: Lars Hjemli <hjemli@gmail.com>
diff --git a/ui-blob.c b/ui-blob.c
index be4fb88..bd44574 100644
--- a/ui-blob.c
+++ b/ui-blob.c
@@ -35,6 +35,8 @@
 	}
 
 	buf[size] = '\0';
-	cgit_print_snapshot_start("text/plain", path, item);
+	ctx.page.mimetype = "text/plain";
+	ctx.page.filename = path;
+	cgit_print_http_headers(&ctx);
 	write(htmlfd, buf, size);
 }