Communicate store refresh and item moves across tabs

[bhollis]

This is something I've been thinking about for a while - it turned out not to be too hard. For folks who open DIM in multiple tabs, the experience can kind of suck, because each tab is its own independent instance. This means they can each load their own view of the profile, and any item moves are only reflected in the tab they're done in.

This PR uses the Web Locks API and BroadcastChannel to sync up multiple tabs. Now, only one tab will refresh the inventory at any given time. When it's done, it notifies all the other tabs to refresh the cached profile from Bungie.net.

I also made it notify about item moves - you can open two windows side by side, and start moving items in one window, those moves will be replicated in the other tab.

It should be pretty easy to expand this to other actions - lock/unlock, DIM API storage (tagging, loadout updates), clearing the "new item" flag.

[sentry-io]

Suspect Issues

This pull request was deployed and Sentry observed the following issues:

• ‼️ TypeError: Failed to fetch /4611686018430317156/d2/ View Issue

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