Get rid of console on Windows

[fkaa]

Currently we don't do anything to the linker flags, so we get both a console and the Iceball window when launching on windows. If we were to get rid of the console it'd be nice to have something like #130 implemented first.

To get rid of the console we must both link to SDL2main and only specify the WINDOWS module in the linker arguments like this:

set(CMAKE_EXE_LINKER_FLAGS  "${CMAKE_EXE_LINKER_FLAGS} -mwindows")

[rakiru]

With these args, does it still output to the console if run from it?

[fkaa]

@rakiru yes, it just hides it when double click on the .exe for example. Unfortunately Visual Studio doesn't have a way to show the output, but I can probably add a option for it to use while devving.

[rakiru]

#ifdef _DEBUG or w/e I guess.

[iamgreaser]

Considering that the window disappears when any code crashes and you have to run from the commandline to see the error anyway, I'm OK with this.