Add timeout to proof generation, and enable cancelling proofs #80
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The former is necessary, as sometimes proof generation will run forever (I believe this is a snag in snarkjs), while the later is just good practice, right now cancelling has no effect but to dismiss a modal that will come back later.
Note that this is the only time we currently are able (i.e. that we implemented) to meaningfully cancel an action. Cancelling at other times (e.g. when sending transactions) will simply cause the modal to be dismissed and to come back later (or the action to complete). We need to implement this too.