BaseTools: Report Structure PCD value and SKU, DefaultStore info

https://bugzilla.tianocore.org/show_bug.cgi?id=706
Add Structure PCD support for Build report. Structure PCD field value described
in DEC/DSC will be display in build report. And, PCD value for each SKU and
Default store will also be shown in build report.

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

BaseTools/Source/Python/Common/GlobalData.py

@@ -24,6 +24,7 @@ gOptions = None
 gCaseInsensitive = False
 gAllFiles = None
 gCommand = None
+gSKUID_CMD = None
 
 gGlobalDefines = {}
 gPlatformDefines = {}
@@ -39,6 +40,8 @@ gCommandMaxLength = 4096
 # for debug trace purpose when problem occurs
 gProcessingFile = ''
 gBuildingModule = ''
+gSkuids = []
+gDefaultStores = []
 
 ## Regular expression for matching macro used in DSC/DEC/INF file inclusion
 gMacroRefPattern = re.compile("\$\(([A-Z][_A-Z0-9]*)\)", re.UNICODE)