Add playerplus variant (suffocation + cactus dmg)

mods/playerplus/README.md

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+# PlayerPlus mod for MineClone 2
+
+## Features
+
+- Hurt players touching cacti (0.5 hearts / 0.5s)
+- Suffocation: Hurt players who have their head inside a solid block (0.5 hearts / 0.5s)
+
+Suffocation *not* dealt to player with the `noclip` privilege.
+
+## Notes
+This mod is based on PlayerPlus [`playerplus`] by TenPlus1. It behaves a bit
+differently than the original, but the API is fully compatible.
+
+## API
+
+Every half second the mod checks which node the player is standing on, which
+node is at foot and head level and stores inside a global table to be used by mods:
+
+- `playerplus[name].nod_stand`
+- `playerplus[name].nod_foot`
+- `playerplus[name].nod_head`
+
+Setting the group `disable_suffocation=1` disables suffocation for nodes which
+would otherwise deal suffocation damage.
+
+## License
+WTFPL.
+