Emulator Support and Issues overhaul

Big overhaul of the Emulator Support and Issues docs, which includes:

- Converting all lists to tables.
- Adding previously-missed hardcore-compliant emulators (DolphinUWP, SkyEmu, Yaba Sanshiro).
- Remove Delta from each system.
- Add intro with hardcore-compliant frontends (including Delta).
- Re-arrange Sega systems to follow on-site naming.

Author: Nepiki