BaseTools/Ecc/EOT: Add Python 3 support on ECC and EOT tools.

1. Add Python 3 support on ECC and EOT tools
2. Add C grammar file of ANTLR4 and fix some bugs

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Hess Chen <hesheng.chen@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>

BaseTools/Source/Python/Eot/InfParserLite.py

@@ -22,8 +22,8 @@ from Common.DataType import *
 from CommonDataClass.DataClass import *
 from Common.Identification import *
 from Common.StringUtils import *
-from .Parser import *
-from . import Database
+from Eot.Parser import *
+from Eot import Database
 
 ## EdkInfParser() class
 #
@@ -153,21 +153,3 @@ class EdkInfParser(object):
         self.ParserSource(CurrentSection, SectionItemList, ArchList, ThirdList)
         #End of For
 
-##
-#
-# This acts like the main() function for the script, unless it is 'import'ed into another
-# script.
-#
-if __name__ == '__main__':
-    EdkLogger.Initialize()
-    EdkLogger.SetLevel(EdkLogger.QUIET)
-
-    Db = Database.Database('Inf.db')
-    Db.InitDatabase()
-    P = EdkInfParser(os.path.normpath("C:\Framework\Edk\Sample\Platform\Nt32\Dxe\PlatformBds\PlatformBds.inf"), Db, '', '')
-    for Inf in P.Sources:
-        print(Inf)
-    for Item in P.Macros:
-        print(Item, P.Macros[Item])
-
-    Db.Close()