Platform/Intel: Add python build scripts

REF:https://bugzilla.tianocore.org/show_bug.cgi?id=1694



This change allows building all the platforms in Platform/Intel with
a single python script. This script works with python 2.7
and python 3.7.

Files Added:

* build_bios.py: the main build script
  build.cfg: contains general/default build settings
* ClevoOpenBoardPkg/N1xxWU/build_config.cfg: contains N1xxWU specific
  build settings
* KabylakeOpenBoardPkg/KabylakeRvp3/build_board.py : contains sample
  custom build script
* KabylakeOpenBoardPkg/KabylakeRvp3/build_config.cfg: contains
  KabylakeRvp3 build settings
* PurleyOpenBoardPkg/BoardMtOlympus/build_board.py: contains
  BoardMtOlympus custom build script
* PurleyOpenBoardPkg/BoardMtOlympus/build_config.cfg: contains
  BoardMtOlympus custom build settings

Cc: Michael Kubacki <michael.a.kubacki@intel.com>
Cc: Nate DeSimone <nathaniel.l.desimone@intel.com>
Cc: Ankit Sinha <ankit.sinha@intel.com>
Cc: Michael D Kinney <michael.d.kinney@intel.com>
Cc: Isaac W Oram <isaac.w.oram@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
Cc: Bowen Zhou <bowen.zhou@intel.com>
Cc: Shifei A Lu <shifei.a.lu@intel.com>

Signed-off-by: Agyeman <prince.agyeman@intel.com>
Reviewed-by: Nate DeSimone <nathaniel.l.desimone@intel.com>
Reviewed-by: Michael Kubacki <michael.a.kubacki@intel.com>
Tested-by: Michael Kubacki <michael.a.kubacki@intel.com>