The Witness: Improve starting inventory

[NewSoupVi]

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1. If an item gets put into the starting inventory, but already exists due to the settings, one instance of it is removed.
2. If an item that does not naturally exist in the settings is put into the starting inventory, it will become logical and associated data is put into slot_data so the client can actually handle it. (only matters for doors & lasers, adding a symbol without symbol shuffle obviously doesn't do anything)

[NewSoupVi]

Test fail? Oh no, let me do an investigate

[NewSoupVi]

Wait it's a Zillion error? o_O

[NewSoupVi]

I found a bug with these changes, I think. Let me investigate

[NewSoupVi]

Nvm, I forgot how my own code works :)

[Berserker66]

This might be good to mention to the user somewhere. Setup Guide, FAQ or such.

[NewSoupVi]

I think that should do :)