Edk2: Retire Edk2Setup.bat
    
    Edk2Setup.bat is out of maintain. It is a draft version batch file, and not
    implement all features listed in its header file. To avoid the confuse,
    drop it from edk2 project, and keep edksetup.bat only.
    
    Contributed-under: TianoCore Contribution Agreement 1.1
    Signed-off-by: Liming Gao <liming.gao@intel.com>
    Reviewed-by: Laszlo Ersek <lersek@redhat.com>