Fix misc MacVim warnings and treat warnings as errors in CI #1457
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In CI, turn on warnings as errors, but ignore deprecated warnings as we are still using NSConnection right now and we won't be fixing that for now. Don't turn on warnings as errors for development (similar to Vim itself) / outside of CI, because it could make it annoying to build MacVim locally and across different Xcode versions.
Fix the misc warnings. A lot of 64/32-bit warnings due to careless casts of NSInteger/NSUInteger.
Also fix up MacVimTests so the waiting for Vim window is more robust when waiting for 2 windows in a row in vim tutor. Otherwise sometimes the tests would randomly fail in CI.