Support quick access to top nav items with Alt 1–9 keyboard shortcuts

[blabno]

Fixes #1286

[blabno]

Supports left Alt on linux. I need to obtain Mac to test that rounted sharp key.

[cbeams]

I just quickly tested on mac, none of the keys work.

[cbeams]

Also, @blabno, it's probably best to implement this in a way that follows the existing approach for supporting keyboard shortcuts, which you can find at https://github.com/bisq-network/exchange/blob/master/gui/src/main/java/io/bisq/gui/app/BisqApp.java#L249-L284. If you follow that convention, these keyboard shortcuts should "just work" across all platforms, or at the very least, they will work as well as other, existing, keyboard shortcuts do across all platforms.

For example, line https://github.com/bisq-network/exchange/blob/master/gui/src/main/java/io/bisq/gui/app/BisqApp.java#L261, is where the CMD-J shortcut is configured, which opens the emergency wallet tool.

[blabno]

@cbeams I've pushed new commit using suggested approach. You can give it a try.

[cbeams]

NACK. The substance of the PR looks good, and I've tested it locally on my Mac, where everything works as expected. Just need to clean up the imports and we're good.

[cbeams]

Please don't expand these imports or the others that have been expanded below. The built-in IDEA settings should handle this correctly when running Optimize Imports. You may not be sync'd up correctly with those settings, or perhaps you're using some other IDE, in which case you'll need to take greater care to get it right manually.

In any case, please keep PRs atomic and avoid mixing in unrelated changes.

[blabno]

Sorry, I didn't see .gitignore ignores .idea but actually keeps code style.
I've optimized imports using Bisq code style.

[cbeams]

ACK, thanks @blabno!

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