request: merge multiplayer PRs

Hello

I noticed some very interesting PRs by SailorSat and tested them on my own XCode builds on following high-end system. Each of the supported games were tested +/- 1 hour by friends with the max. number of players supported.

Mac Studio:
MAME XCode builds
Apple Silicon M3 Ultra, 32‑core CPU, 80-core GPU, 32‑core Neural Engine
512 GB unified RAM
16 TB SSD

#13867
#13866
#13865
#13863
#13862
#13861
#13853
#13852

Can I kindly ask why nobody merged those?
Performance and real life playing are great, with absolutely no crashes or deadlocks. However, I didn't look at the source.

PS: thanks to Ariane Fugmann for the AMAZING gameplay you gave us! ^^

Gameplay videos:

https://m.youtube.com/@Soft15kHz/videos