1) Add BufToHexString, HexStringToBuf and IsHexDigit to BaseLib.

2) Remove the duplicated functions implementation  from the modules that reference these APIs 

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@5283 6f19259b-4bc3-4df7-8a09-765794883524

MdeModulePkg/Universal/SetupBrowserDxe/IfrParse.c

@@ -21,7 +21,6 @@ Abstract:
 
 #include "Setup.h"
 #include "Ui.h"
-//@MT:#include "EfiPrintLib.h"
 
 UINT16           mStatementIndex;
 UINT16           mExpressionOpCodeIndex;