Configurable config dir and other commandline parameters

[Luckz]

https://github.com/JustArchi/ArchiSteamFarm/wiki/Command-Line-Arguments

[Luckz]

Now we can haz switch to --process-required instead of --server.

[Luckz]

Now we can haz switch to --process-required instead of --server.

In ec2a2d3