If the user has only one weapon, do not notify them of switching from it to itself

[Edward Hart-Davis]

Having-fun example attached.

[Anna Bakker]

Why only if they have one weapon? Is it useful to be able to switch from spreadgun to spreadgun if you have multiple weapons? (So it says what gun you're using).

Maybe you shouldn't be able to switch to a gun if it is already selected, or instead it could say that you're already using it.

[Riot]

don't update stats or announce weapon switching if original and new weapons are the same, resolves #369

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