Moving corlib files out of "System" directory into root

BeefLibs/corlib/src/System/IO/FileMode.bf

@@ -1,32 +0,0 @@
-// This file contains portions of code released by Microsoft under the MIT license as part
-// of an open-sourcing initiative in 2014 of the C# core libraries.
-// The original source was submitted to https://github.com/Microsoft/referencesource
-
-using System;
-
-namespace System.IO
-{
-	public enum FileMode
-	{
-        /// Creates a new file. Fails if the file already exists.
-		CreateNew = 1,
-    
-        /// Creates a new file. If the file already exists, it is overwritten.
-		Create = 2,
-    
-        /// Opens an existing file. Fails if the file does not exist.
-		Open = 3,
-    
-        // Opens the file if it exists. Otherwise, creates a new file.
-		OpenOrCreate = 4,
-    
-        // Opens an existing file. Once opened, the file is truncated so that its
-        // size is zero bytes. The calling process must open the file with at least
-        // WRITE access. Fails if the file does not exist.
-		Truncate = 5,
-        
-        // Opens the file if it exists and seeks to the end.  Otherwise, 
-        // creates a new file.
-		Append = 6,
-	}
-}