Add get_wielded_item

doc/client_lua_api.txt

@@ -721,6 +721,7 @@ Call these functions only at load time!
 * `minetest.after(time, func, ...)`
     * Call the function `func` after `time` seconds, may be fractional
     * Optional: Variable number of arguments that are passed to `func`
+
 ### Map
 * `minetest.get_node(pos)`
     * Returns the node at the given position as table in the format
@@ -728,6 +729,11 @@ Call these functions only at load time!
       for unloaded areas.
 * `minetest.get_node_or_nil(pos)`
     * Same as `get_node` but returns `nil` for unloaded areas.
+
+### Player
+* `minetest.get_wielded_item()`
+    * Returns the itemstack the local player is holding 
+
 ### Misc.
 * `minetest.parse_json(string[, nullvalue])`: returns something
     * Convert a string containing JSON data into the Lua equivalent