Various fixes

[reaperhulk]

This PR makes a variety of changes to the project, some of which may be desirable, some of which could be better. I've tried to separate each commit so they can be cherry-picked or improved as you desire. 😄

The changes:

1. Resized the menu bar images so they appear the correct size. When the new images were committed several years ago they were apparently contributed at 100px/200px/300px height. This looks great, but macOS (at least as of Xcode 13.2.1 in macOS 12.1) doesn't properly scale them. So instead we scale them to 22px/44px/66px respectively.
2. Fix the submodule commit hash (and extraneous submodule that used a relative path) to point at an existing commit that is compatible with the current project source. I did not upgrade to latest here.
3. Added a bit of debug code in various places just so I could understand the errors I was seeing better.
4. Switched from xpc_connection_send_message_with_reply to xpc_connection_send_message_with_reply_sync because it appeared there was a race condition in the async code in the action selector assuming xpc_connection_send_message_with_reply immediately returns. Maybe I'm wrong about this though (please let me know if so!)
5. Updated a few calls to non-deprecated versions. There are a variety of other project settings that Xcode would like to update, but that's a much larger change so I've deferred it for now.
6. Fixed helper crashes caused by multiple calls to IOHIDManagerScheduleWithRunLoop with the same hidManager. In macOS 10.15+ this causes an assertion failure.
7. Added a very primitive dialog that tells you yubiswitch requires Accessibility enabled to function (which then redirects you to the correct System Preferences pane and tab).

As a consequence of these changes yubiswitch does now properly disable on start (previously I had to toggle it on and off a few times to reliably get it to disable).

[stevenharman]

@reaperhulk Thank you so much for this! I hope @pallotron has a chance to incorporate these and cut a new build 🔜. I've got an M1 personal machine and we've started to move to M1s for work as well. I really miss YubiSwitcher on my M1!

[pallotron]

Thanks! Sorry about late merge. I don't have much time to dedicate to personal projects.

In fact I should probably seek a new owner for this project :)

[reaperhulk]

You might want to shift this repo to its own GitHub org to make it easier to expand maintainers and manage it. I’m not familiar with best practices for managing an OSS project that also needs an apple developer subscription for signing/notarizarion though. I would be willing to help out (although I emphasize that I am not an objective-C developer, I was just motivated to get this working 😂)

[davidrothera]

I can help out and have a developer account to perform releases.

[erikdw]

@reaperhulk : thanks so much for this fix, I'm looking forward to taking advantage of it.
@davidrothera : would you be able to somehow create a new image with this fix in it?

[davidrothera]

Sure thing, I'll do it this evening.

[pallotron]

Let me add you as maintainer on this project. Thanks @davidrothera