Add Emulator Support (#35)

* Add emulator

* Update limit for ESPM API

* use params

---------

Co-authored-by: Alex Resnick <adr8282@gmail.com>

src/display_manager.py

@@ -1,4 +1,8 @@
-from rgbmatrix import RGBMatrix, RGBMatrixOptions
+import os
+if os.getenv("EMULATOR", "false") == "true":
+    from RGBMatrixEmulator import RGBMatrix, RGBMatrixOptions
+else:
+    from rgbmatrix import RGBMatrix, RGBMatrixOptions
 from PIL import Image, ImageDraw, ImageFont
 import time
 from typing import Dict, Any, List, Tuple