Make cells modular, add crosses and t junctions and houses which have example texture and dont work yet, improve code quality, fix cell texture not being the same when pressed

game/cells.py

@@ -0,0 +1,17 @@
+from game.cell import Cell
+
+class House(Cell):
+    def __init__(self, left_neighbour, top_neighbour):
+        super().__init__("house", left_neighbour, top_neighbour)
+
+class PowerSource(Cell):
+    def __init__(self, left_neighbour, top_neighbour):
+        super().__init__("power_source", left_neighbour, top_neighbour)
+        self.on_click = lambda e: self.next_rotation()
+
+class PowerLine(Cell):
+    def __init__(self, cell_type, left_neighbour, top_neighbour):
+        super().__init__(cell_type, left_neighbour, top_neighbour)
+
+        if not cell_type == "cross":
+            self.on_click = lambda e: self.next_rotation()