ShellPkg: Fixes for shell application launch, argument handling, and version output:

- Fixes shell application launch version output to match ‘ver’ command, as specified by the UEFI Shell spec.
- Adds PcdShellSupplier for <shell-supplier-specific-data> line of version output.  Defaulted to “EDK II”.
- Display only 1 startup.nsh countdown line per second instead of 10 per second.
- Fix issue where command line is just 1 or more “ “ characters and displayed garbage.
- Fix for @echo –off and @echo –on to not restore echo state

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Chris Phillips <chrisp@hp.com>
reviewed-by: Jaben Carsey <Jaben.Carsey@intel.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@14784 6f19259b-4bc3-4df7-8a09-765794883524

ShellPkg/Library/UefiShellLevel3CommandsLib/UefiShellLevel3CommandsLib.inf

@@ -2,6 +2,7 @@
 # Provides shell level 3 functions
 # Note that the interactive versions of the time, date, and timezone functions are handled in the level 2 library.
 #
+# Copyright (c) 2013, Hewlett-Packard Development Company, L.P.
 # Copyright (c) 2009-2011, Intel Corporation. All rights reserved. <BR>
 #
 #  This program and the accompanying materials
@@ -66,4 +67,5 @@
 [Pcd.common]
   gEfiShellPkgTokenSpaceGuid.PcdShellSupportLevel
   gEfiShellPkgTokenSpaceGuid.PcdShellFileOperationSize
+  gEfiShellPkgTokenSpaceGuid.PcdShellSupplier