refactor: add base class for all game objects

Tetris.py

@@ -1,5 +1,6 @@
 import sys
 import pygame
+
 from util.ConfigurationManager import ConfigurationManager
 from util.PieceGenerator import PieceGenerator 
 from entity.Well import Well
@@ -15,7 +16,7 @@ class Tetris:
         self.well = None
         self.current_piece = None
 
-    def initialize(self):
+    def initialize(self) -> None:
         pygame.init()
 
         win_width = ConfigurationManager.configuration["window"]["width"]
@@ -34,7 +35,7 @@ class Tetris:
         pygame.display.set_icon(loaded_icon)
 
     # gets called from the games main loop
-    def update(self):
+    def update(self) -> None:
         # TODO write not initialized exception
 
         self.clock.tick(self.fps)
@@ -58,8 +59,10 @@ class Tetris:
                         self.current_piece.move((0, self.tile_size))
                 if event.key == pygame.K_z:
                     self.__generate_piece((300, 100))
+                if event.key == pygame.K_x:
+                    self.current_piece.revert()
 
-    def draw(self):
+    def draw(self) -> None:
         # TODO write not initialized exception
 
         # draw window bg