Move files from Frontend directory to pcsx2 and/or subdirectories.
Get rid of double GS init.
Combine HostSettings and Host.
Combine Frontend/Achievements.h and Achievements.h.
- Adding the actual corrections from #8048 that were not added by #8119.
- Fixing typos and missing ending periods.
- Unifying the writing of certain terms:
- Memory Card uppercased following Sony's writing (taken from PS2 manual).
- gamefixes/game fixes -> game fixes
- fast forward/fastforward/fast-forward -> fast-forward (taken from Oxford)
- slowmotion/slow motion/slow-motion -> slow-motion (following the same convention as before, as I could not find this in Oxford's)
- framebuffer/frame buffer -> framebuffer
- Xbox name properly uppercased (for Controller settings)
- Correcting RA's Rich Presence to separate it from Discord's Rich Presence (after discussions in the Translations channel).
- Unification of option names in the option area and the hint area.
- Adding a fix for the (currently broken) Stretch Height/Vertical Stretch tooltip.