Implement vector and node conversion in Lua (#12609)

Co-authored-by: sfan5 <sfan5@live.de>

builtin/common/vector.lua

@@ -6,8 +6,10 @@ Note: The vector.*-functions must be able to accept old vectors that had no meta
 -- localize functions
 local setmetatable = setmetatable
 
--- vector.metatable is set by C++.
-local metatable = vector.metatable
+vector = {}
+
+local metatable = {}
+vector.metatable = metatable
 
 local xyz = {"x", "y", "z"}
 
@@ -366,3 +368,22 @@ function vector.dir_to_rotation(forward, up)
 	end
 	return rot
 end
+
+if rawget(_G, "core") and core.set_read_vector and core.set_push_vector then
+	local function read_vector(v)
+		return v.x, v.y, v.z
+	end
+	core.set_read_vector(read_vector)
+	core.set_read_vector = nil
+
+	if rawget(_G, "jit") then
+		-- This is necessary to prevent trace aborts.
+		local function push_vector(x, y, z)
+			return (fast_new(x, y, z))
+		end
+		core.set_push_vector(push_vector)
+	else
+		core.set_push_vector(fast_new)
+	end
+	core.set_push_vector = nil
+end