Remove GTK+2 support. #372
Merged
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Although it had HIRO_GTK==3 sections, hiro/gtk/monitor.cpp was actually using deprecated GTK+2 APIs on GTK3, and the GTK3 code was broken and wouldn't compile.
I only have a single, standard-resolution monitor here to test with, I would appreciate testing from people who have multiple monitors, and hi-DPI monitors too since I modified that code.