Steam Detection and Steam Integration Fixes

[drojf]

I wanted some way to detect whether the game was a Steam install or not, so I Iooked into how the steam stuff works

This PR does the following:

• Improve error messages when you run the game without steam on a Steam install of the game (previously, and exception was printed)
• Restart the game with steam integration, if you don't launch the game through steam (similar to unmodded game)
  • This was requested in Force-run with Steam, but only in Steam versions #35
  • I tested what happens if you delete steam, then run the game, and it works correctly (the game just continues running)
  • WIP: would like some way to opt out of this if things go wrong
• Remove a duplicate SteamManager.cs which is not compiled into the DLL

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Links:

• Steamworks.net, which our mod uses for steam integration (?) https://steamworks.github.io/
• We actually use Steamworks.net, but this provides a good reference anyway (some API is missing in our mod) https://wiki.facepunch.com/steamworks/

[drojf]

I noticed an issue with this, under the following conditions:

• You have a normal install of the game installed via steam at some location
• You have an extra install of the game somewhere else (perhaps by copying the game folder)

If you double click to launch the 'extra' install of the game when steam is not running, it will instead launch the 'normal' install of the game (the one which Steam knows about). This would be a problem if you have say, Ch.4 installed with the normal mod, and a copy of Ch.4 installed with the Console arcs - launching the Console arcs would cause the normal mod to launch.

I tested what happens if you just have steam running and launch the game from outside steam, and that still does not appear to activate steam integration.

I can't think of an easy direct solution for now, but I guess the cases are:

• game is installed at normal location. In which case, restart and launch Steam is OK
• game is not installed at normal location, in which case the game should launch directly without steam

I can't really think of an easy way to detect these cases though.

An easy indirect solution would be to just explain to users that Steam integration doesn't work if you don't install the game to the default location.