Add per-emulator version information

This could go after each emulator name in the header, e.g. "SameBoy (1.0.2 macOS)" or "bgb [1.6.6]", or go in a separate row under the header.

Even though there's an "Updated On" date, it's not safe to assume that the latest version of each emulator at that date was used (especially when different versions exist, e.g. SameBoy's availability/updatedness on different platforms). And it's easier to look at the emulator oneself uses and compare it with a benchmarked version number directly.