This adds the new APIs for UEFI Shell 2.1 and makes a new structure for shell implementations that are conformant to this new spec.  It does not affect existing implementations.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jaben Carsey <jaben.carsey@intel.com>
Reviewed-by: Erik Bjorge <erik.c.bjorge@intel.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@15752 6f19259b-4bc3-4df7-8a09-765794883524
ShellPkg: Add Dynamic GUID registration into the current GUID<->String conversion process

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jaben Carsey <jaben.carsey@intel.com>
Reviewed-by: Erik Bjorge <erik.c.bjorge@intel.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@15753 6f19259b-4bc3-4df7-8a09-765794883524