add --norandom to client to disable shot randomization

[thewavelength]

This change allows the client to pass -n (--norandom) to the launcher to disable any shot randomization.
In our group of players we consider this "pro mode" as luck is being removed from the equation.

[PhilippvK]

@thewavelength Thank you for your contribution.
I gave it a try and it looks fine. I really don't like that this stuff (like aimbot etc.) is managed on the client-side, but that's how the game was designed...

On the long term I would strive for the following:

• Use a config file for such settings instead of command line flags
• communicate these options with the server to detect which features are enabled on the client

However both points are out of scope for the near future.

[PhilippvK]

I will likely merge this in the next few days unless @pehala has something against it.

[thewavelength]

I also had a quick look in the source and maybe it can be hacked into the basicinfo message which comes from the server.