Add Processing Loops section

[jamaljsr]

Closes #12

This PR adds the Processing Loops section which displays a realtime progress for every incomplete swap. The progress bar automatically updates as blocks are mined and the swap's state progresses forward.

Steps to test

1. initiate a swap
2. Confirm the Processing Loops box is displayed at the top of the page
3. In a terminal, mine 1 block
4. Confirm the progress bar for the swap advances one step further
5. In a terminal, mine another block
6. Confirm the swap's status moves to 100%
7. Click the Collapse icon on the top right to close the Processing Loops box

[guggero]

Reviewed as part of #39.