Use a custom I-beam mouse cursor for pre-Mojave OS versions #975
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Prevoiusly, #859 removed the custom high-contrast I-beam mouse cursor in favor of using the system-default I-beam cursor. However, it mostly worked well on 10.14 Mojave or above, as the cursor is designed with dark mode in mind and works well on both bright and dark backgrounds. Since this doesn't work well on older macOS versions, add back the custom cursor and only enable it on those older macOS versions.
Fix #910.