move settings to file, fix error if no banned_addresses.txt

settings.py

@@ -0,0 +1,11 @@
+default_settings = '''route_tor = False
+port_number = 80
+allow_foreign_addresses = False
+'''
+exec(default_settings)
+try:
+    with open('settings.txt', 'r', encoding='utf-8') as file:
+        exec(file.read())
+except FileNotFoundError:
+    with open('settings.txt', 'a', encoding='utf-8') as file:
+        file.write(default_settings)