new documentation and some fixes in code

docs/lua/Item.lua

@@ -0,0 +1,22 @@
+-- luacheck: ignore 111
+
+--[[--
+Barotrauma Item class with some additional functions and fields
+
+Barotrauma source code: [Item.cs](https://github.com/evilfactory/Barotrauma-lua-attempt/blob/master/Barotrauma/BarotraumaShared/SharedSource/Items/Item.cs)
+]]
+-- @code Item
+
+--- Adds to remove queue, use this instead of Remove, to prevent desync.
+-- @realm server 
+function AddToRemoveQueue(item) end
+
+
+--- Sends a signal.
+-- @realm server 
+function SendSignal(signalOrString, connectionOrConnectionName) end
+
+--- List of all items.
+-- @treturn table
+-- @realm shared 
+ItemList = {}