BaseTools: Add ConvertMasmToNasm.py script

This script is intended to assist with MASM to NASM syntax
conversions.

The output should be manually inspected and adjusted as needed, since
this script does not provide a perfect conversion.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jordan Justen <jordan.l.justen@intel.com>
Acked-by: Yingke D Liu <yingke.d.liu@intel.com>

git-svn-id: svn://svn.code.sf.net/p/edk2/code/trunk/edk2/BaseTools@16285 6f19259b-4bc3-4df7-8a09-765794883524
EDK II Contributions.txt: Update patch format information

Update to show what the patch looks like in email form.

NOTE: This does not modify the wording of the "TianoCore Contribution
      Agreement 1.0" section

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jordan Justen <jordan.l.justen@intel.com>
Reviewed-by: Jaben Carsey <jaben.carsey@intel.com>

git-svn-id: svn://svn.code.sf.net/p/edk2/code/trunk/edk2/BaseTools@16297 6f19259b-4bc3-4df7-8a09-765794883524