Extract a function or class to step away from God Object.

See:

* https://en.wikipedia.org/wiki/God_object

* https://www.c-sharpcorner.com/article/god-object-a-code-smell/ .

This is Refactoring / code cleanup.

See:

* https://refactoring.com/catalog/extractMethod.html

* https://en.wikipedia.org/wiki/Code_refactoring

* https://www.refactoring.com/

* https://www.joelonsoftware.com/2002/01/23/rub-a-dub-dub/

Some small optimisations may have slipped in as well.

pysollib/game/__init__.py

@@ -450,6 +450,13 @@ class GameMoves(NewStruct):
     index = attr.ib(default=0)
     state = attr.ib(default=S_PLAY)
 
+# used when loading a game
+@attr.s
+class GameLoadInfo(NewStruct):
+    ncards = attr.ib(default=0)
+    stacks = attr.ib(factory=list)
+    talon_round = attr.ib(default=1)
+
 
 class Game(object):
     # for self.gstats.updated
@@ -699,11 +706,7 @@ class Game(object):
         self.saveinfo = Struct(         # needed for saving a game
             stack_caps=[],
         )
-        self.loadinfo = Struct(         # used when loading a game
-            stacks=None,
-            talon_round=1,
-            ncards=0,
-        )
+        self.loadinfo = GameLoadInfo()
         self.snapshots = []
         self.failed_snapshots = []
         # local statistics are reset on each game restart