Add some basic field width support to printf().

Use it to make "ls" output a bit better. Also sys$spawn now fails with EACCES
if the path is not a file that's executable by the current uid/gid.

VirtualFileSystem/FileHandle.h

@@ -1,6 +1,7 @@
 #pragma once
 
 #include "VirtualFileSystem.h"
+#include "InodeMetadata.h"
 #include <AK/ByteBuffer.h>
 
 class FileHandle {
@@ -22,6 +23,8 @@ public:
 
     bool isDirectory() const;
 
+    InodeMetadata metadata() const { return m_vnode->metadata(); }
+
     VirtualFileSystem::Node* vnode() { return m_vnode.ptr(); }
 
 #ifdef SERENITY