chore: env variables in python examples

examples/python/pocket.py

+from os import getenv
 from time import time
 from boytacean import GameBoy, VISUAL_FREQ
 from os.path import dirname, realpath, join, splitext, basename
@@ -8,7 +9,7 @@ ROM_NAME = splitext(basename(ROM_PATH))[0]
 IMAGE_NAME = f"{ROM_NAME}.png"
 
 FRAME_COUNT = 12000
-LOAD_GRAPHICS = False
+LOAD_GRAPHICS = bool(getenv("LOAD_GRAPHICS", True))
 
 gb = GameBoy(apu_enabled=False, serial_enabled=False, load_graphics=LOAD_GRAPHICS)
 gb.load_rom(ROM_PATH)

examples/python/pocket_pyboy.py

+from os import getenv
 from time import time
 from pyboy import PyBoy
 from os.path import dirname, realpath, join, splitext, basename
@@ -9,7 +10,7 @@ IMAGE_NAME = f"{ROM_NAME}_pyboy.png"
 
 FRAME_COUNT = 12000
 VISUAL_FREQ = 59.7275
-LOAD_GRAPHICS = False
+LOAD_GRAPHICS = bool(getenv("LOAD_GRAPHICS", True))
 
 with PyBoy(
     ROM_PATH,

examples/python/pocket_pyboy_iface.py

+from os import getenv
 from time import time
 from boytacean import VISUAL_FREQ
 from boytacean.pyboy import PyBoy
@@ -10,7 +11,7 @@ ROM_NAME = splitext(basename(ROM_PATH))[0]
 IMAGE_NAME = f"{ROM_NAME}_pyboy_iface.png"
 
 FRAME_COUNT = 12000
-LOAD_GRAPHICS = False
+LOAD_GRAPHICS = bool(getenv("LOAD_GRAPHICS", True))
 
 with PyBoy(
     ROM_PATH,