0.8.5-Update-1

Update 1: Fix syntax highlighting for Objective-C #48

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• May fix #43 that the app is freezing for some users by changing LazyVGrid to VStack (Why?). Big thanks to @timwredwards and @cr2s367067 for helping me locate the bug. I wasn't able to reproduce the bug on 2 of my machines, so I'm not completely certain that it's fixed or that it won't resurface in the future.
• Done some cleanup in the suspicious areas that look relevant to the bug.
• Updated copilot.vim to 1.8.3

If the app still freezes, please reply to issue #43, and give 0.8.4 a try. Maybe I made some mistakes again, sigh.