Add possibility to define the background color of entities (black in ASCII, white in Unicode)

dungeonbattle/display/display.py

@@ -19,6 +19,13 @@ class Display:
     def newpad(self, height: int, width: int) -> Union[FakePad, Any]:
         return curses.newpad(height, width) if self.screen else FakePad()
 
+    def init_pair(self, number: int, foreground: int, background: int) -> None:
+        return curses.init_pair(number, foreground, background) \
+            if self.screen else None
+
+    def color_pair(self, number: int) -> int:
+        return curses.color_pair(number) if self.screen else 0
+
     def resize(self, y: int, x: int, height: int, width: int) -> None:
         self.x = x
         self.y = y