add scale. fix algin property name in ex json. implement color and background_color

Author: FoamyGuy

adafruit_slideshow.py

@@ -332,7 +332,11 @@ def _fade_down(self):
 
     def _create_label(self, file):
         json_data = json.loads(file.read())
-        label = bitmap_label.Label(terminalio.FONT, text=json_data['text'])
+        _scale = 1
+        if "scale" in json_data:
+            _scale = int(json_data["scale"])
+
+        label = bitmap_label.Label(terminalio.FONT, text=json_data['text'], scale=_scale)
         if "h_align" not in json_data or json_data["h_align"] == "LEFT":
             x_anchor_point = 0.0
             x_anchored_position = 0
@@ -361,6 +365,12 @@ def _create_label(self, file):
             y_anchor_point = 0.0
             y_anchored_position = 0
 
+        if "background_color" in json_data:
+            label.background_color = int(json_data["background_color"], 16)
+
+        if "color" in json_data:
+            label.color = int(json_data["color"], 16)
+
         label.anchor_point = (x_anchor_point, y_anchor_point)
         label.anchored_position = (x_anchored_position, y_anchored_position)
         return label

examples/images/sample_text_slide.json

@@ -1,7 +1,8 @@
 {
   "text": "Sample Text\nSlideshow",
-  "h_alignment": "CENTER",
-  "v_alignment": "CENTER",
+  "h_align": "CENTER",
+  "v_align": "CENTER",
   "color": "0x0000FF",
-  "background_color": "0xFF00FF"
+  "background_color": "0xFF00FF",
+  "scale": 2
 }