Compile for Windows subsystem on Windows OS

[ForNeVeR]

Currently, our executable is compiled for the console subsystem (aka /SUBSYSTEM:CONSOLE in terms of MS linker). This means it will open a console window when started, which is not wanted for a casual player.

I suggest us to do otherwise.

1. Write most of the output to a log file by default

2. Compile our Windows binary for Windows subsystem

3. On startup, detect if there's an associated console available, and use it for console-only output

   As a note, I believe IntelliJ's new cross-platform launcher currently behaves like this.