BaseTools: Customize deepcopy function.

https://bugzilla.tianocore.org/show_bug.cgi?id=1288

This patch is one of build tool performance improvement
series patches.

This patch is going to customize the deepcopy function for
SkuClass, PcdClassObject and python dictionary.

python deepcopy copy everything of a object, but for our current
usage we just need to copy the data we care about recursively.

By implementing __deepcopy__ for SkuClass, PcdClassObject, we can customize
deepcopy function for them.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: BobCF <bob.c.feng@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
Cc: Jaben Carsey <jaben.carsey@intel.com>
Reviewed-by: Jaben Carsey <jaben.carsey@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>

BaseTools/Source/Python/Common/Misc.py

@@ -41,6 +41,7 @@ import uuid
 from CommonDataClass.Exceptions import BadExpression
 from Common.caching import cached_property
 import subprocess
+from collections import OrderedDict
 ## Regular expression used to find out place holders in string template
 gPlaceholderPattern = re.compile("\$\{([^$()\s]+)\}", re.MULTILINE | re.UNICODE)
 
@@ -2130,6 +2131,21 @@ def PackByteFormatGUID(Guid):
                 Guid[10],
                 )
 
+## DeepCopy dict/OrderedDict recusively
+#
+#   @param      ori_dict    a nested dict or ordereddict
+#
+#   @retval     new dict or orderdict
+#
+def CopyDict(ori_dict):
+    dict_type = ori_dict.__class__
+    new_dict = dict_type()
+    for key in ori_dict:
+        if isinstance(ori_dict[key],(dict,OrderedDict)):
+            new_dict[key] = CopyDict(ori_dict[key])
+        else:
+            new_dict[key] = ori_dict[key]
+    return new_dict
 ##
 #
 # This acts like the main() function for the script, unless it is 'import'ed into another