Add mods: technic, moreores, paintings, Nyancat (Pbj_pup). Small fix: sandwiches

mods/xcompat/doc/functions.md

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+# Functions API
+
+## `can_interact_with_node(player, pos)`
+returns `bool`
+
+checks for the ability to interact with a node via:
+* if a player
+* owner metadata key
+* protection_bypass
+
+supports
+* minetest game default if present
+* else polyfill