Add conversion between 162 currencies

[utopiatopia]

Fixes #153 in part. For those curious, here's the script I used.

[robinmetral]

Nice 😬 Out of curiosity, what are the downsides of adding this many new bangs to the file, besides freezing github.dev?

On top of my head, making the bangs.json file much larger might have side-effects for any consumers of the file, e.g. these "bangs everywhere" addons (thinking of yang right now)

[utopiatopia]

It’s untenable if ISO/XE decides to remove or add currencies. You’d have edit a few hundred entries, or delete the XE block, then rerun my script.

I’ll also add, there’s better ways to implement this within Kagi. Despite this, this PR still exists as an implementation of your idea (if accepted)