Describe the bug
Option Map Zoom is not cycling like all the rest of the options. Sometimes it will cycle correctly, other times it will cycle one value step, and most of the time it doesn't change at all.

To Reproduce
Steps to reproduce the behavior:

1. Go to Audio and Zoom options
2. Click on Map Zoom
3. See cycle not happen.

Expected behavior
Values should cycle like

Operating System: Any

Commit/build: None

Original game source: Any

*Reproducible in the original Generals Zero Hour?
Multiplayer affected?
Are you using any mods? (like Gentool, Rise of the Reds or Contra)

Issue explanation

Plain string files cannot reliably be read from .big files as they rely on line ending conversions of text mode file IO and .big file contents c

Currently if a unit is spotted by a third party but not in direct line of sight of a shooter, the shooter will still shoot. This should not happen.

There are a number of mysterious errors which indicate that sometimes clients are sending malformed protocol messages:

ERROR    Sep 03  21:05:08 ServerContext                  Invalid control character at: line 1 column 728 (char 727)
Traceback (most recent call last):
  File "/code/server/servercontext.py", line 80, in client_connected
    message = await protocol.read_message()
  Fil