Allow Bob to withdraw L1 liquidity

[lalexgap]

To allow Bob to satisfy L2 (https://www.notion.so/Desired-security-and-usability-properties-a07341b850274837ae48370e3e6b20e8?d=0884756d90e94183a876e574bf3d63ef#3924d381ae6f4ca68db1cee326366e5e) he needs a way to remove liquidity from L1.

@andrewgordstewart suggested Bob could just submit a ticket for himself. Does there need to be a special case for Bob so he doesn't have to lock funds up in escrow?

[lalexgap]

I think Bob could technically submit his own swap with the current protocol.

If bob wants to remove liquidity he:

• Deposits funds on L2 and register a swap
• Authorize a batch with his swap
• Claim batch on L1
• Reclaim the funds he locked in escrow on L2

This does mean that he has to lock up extra L2 funds to withdraw L1 funds. In practice we'd probably want to support a special case for Bob so he doesn't have to lock up L2 funds in escrow that he is just going to get back.