Add support for multiple burst modes

[NaturesWitness]

Was reading some comments on the forums, and it seems a lot of people would like a way to fire smaller bursts with some of the full-auto weapons. It occurred to me, would it be possible to change the "burst" field in the item jsons to accept multiple values?

For example, a weapon could have "burst": [3, 10] and be able to cycle from single shot, 3-round burst, and 5-round burst with the burst mode key.

How hard would it be to implement something like this?

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[kevingranade]

Not terribly hard, some minor surgery on game::fire(). I've been meaning
to do this for... over a year now. (I added the initial firing mode last
christmas)

[NaturesWitness]

It's good to hear this should be durable. I was considering trying to make a select-fire gun using the Heatblade weapon switching code, which would have been a huge, cluttered mess. I'll just wait until someone has a chance to implement the game::fire method instead.

[chaosvolt]

This would also mesh well with guns that are fully-automatic but lack selective fire, if you can assign randomly-selected burst lengths from a range of minimum and maximum shots.

[mugling]

Now supported in master