Test -alternate-mouse on a mac

[squizzling]

If someone has access to a mac and can test the client with -alternate-mouse, and confirms that the mouse still works, we can make it the default behavior and remove the flag and workaround.

I guess that means testing in iterm and iterm2? I'm not sure what the common terminals are for mac.

[TheGoblinHero]

Not a mac, but still a report: I'm on linux and my mouse now works with -alternate-mouse. TY!

[squizzling]

Thanks for the feedback, I wasn't aware the mouse wasn't working in some Linux configurations. Perhaps we should flip the default.