Pass Preferences object directly to BaseCardType and ImageMaker

Should not rely on global preferences object, #311 will pass the Preferences directly into the BaseCardType.__init__()

modules/BaseCardType.py

@@ -98,7 +98,8 @@ def USES_SEASON_TITLE(self) -> bool:
 
 
     @abstractmethod
-    def __init__(self, blur: bool = False, grayscale: bool = False) -> None:
+    def __init__(self, blur: bool = False, grayscale: bool = False, *,
+                preferences: 'Preferences' = None) -> None:
         """
         Construct a new CardType. Must call super().__init__() to
         initialize the parent ImageMaker class (for PreferenceParser and
@@ -111,7 +112,7 @@ def __init__(self, blur: bool = False, grayscale: bool = False) -> None:
         """
 
         # Initialize parent ImageMaker
-        super().__init__()
+        super().__init__(preferences=preferences)
 
         # Object starts as valid
         self.valid = True

modules/ImageMaker.py

@@ -43,14 +43,18 @@ class ImageMaker(ABC):
 
 
     @abstractmethod
-    def __init__(self) -> None:
+    def __init__(self, *, preferences: 'Preferences' = None) -> None:
         """
         Initializes a new instance. This gives all subclasses access to
         an ImageMagickInterface via the image_magick attribute.
         """
 
+        if preferences is None:
+            self.preferences = global_objects.pp
+        else:
+            self.preferences = preferences
+
         # All ImageMakers have an instance of an ImageMagickInterface
-        self.preferences = global_objects.pp
         self.image_magick = ImageMagickInterface(
             self.preferences.imagemagick_container,
             self.preferences.use_magick_prefix,