Add labels to mipsy_web data view

[joooooooooooooooooooooooooooooooooooosh]

doesn't need to be in this PR but adding a button somewhere to toggle the labels showing in the rendered data segment itself rather than just hovering on tooltip would be nice

[Dylan-Brotherston]

This has a massive performance overhead and might want to be rolled back and rethought.

[joooooooooooooooooooooooooooooooooooosh]

wait really? can you give examples of where this is noticeable? The only thing added I can see that could have a noticeable perf impact is the label iteration on every byte, but this could be rethought easily by creating a HashMap once before the loops start

[Dylan-Brotherston]

It's hard to do an exact benchmark. But it is noticeably slower.

If you are actively viewing the data tab it is extremely obvious it has slowed down.

[joooooooooooooooooooooooooooooooooooosh]

I'm not noticing anything? Stepping through commands that modify the data tab and/or position of $sp/$fp affect the data tab instantaneously and even running two_powerful to completion updates without issue.