make better save and load function of files and add snake config into a json file

server/Files.py

@@ -0,0 +1,16 @@
+import os
+
+def read_file(path, callback=None):
+  if os.path.exists(path):
+    with open(path, 'r') as f:
+      data = callback(f)
+    return data
+  else:
+    return None
+
+def save_file(path, data, callback=None, *args, **kwargs):
+  if not os.path.exists(path):
+    os.makedirs(os.path.dirname(path), exist_ok=True)
+
+  with open(path, 'w') as f:
+    callback(data, f, *args, **kwargs)