BaseTools Script: Add the script to generate Structure PCD setting

BaseTools Script: Add the script to generate Structure PCD setting

Here is this script usage.
1. Build one platform.
2. Use FCE tool to read HII config from the generated FD image.
FCE read -i Platform.fd > Config.txt
3. Call the script to generate StructurePcd setting.
ConvertFceToStructurePcd.py -p Build\PlatformPkg\DEBUG_VS2015x86 \
-c Config.txt -o OutputDir
OutputDir directory has StructurePcd.dec, StructurePcd.dsc, StructurePcd.inf.
4. Refer to wiki https://github.com/lgao4/edk2/wiki/StructurePcd-Enable-Steps
to enable structure pcd in this platform.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Liming Gao <liming.gao@intel.com>
Reviewed-by: Yonghong Zhu <yonghong.zhu@intel.com>