Add ObjectRef:get_inventory() and add stuff to documentation comments

data/mods/default/init.lua

@@ -110,7 +110,10 @@
 -- minetest.chat_send_all(text)
 -- minetest.chat_send_player(name, text)
 -- minetest.get_player_privs(name) -> set of privs
+-- minetest.get_inventory(location) -> InvRef
 -- minetest.get_modpath(modname) -> eg. "/home/user/.minetest/usermods/modname"
+-- ^ location = eg. {type="player", name="celeron55"}
+--                  {type="node", pos={x=, y=, z=}}
 --
 -- stackstring_take_item(stackstring) -> stackstring, item
 -- stackstring_put_item(stackstring, item) -> stackstring, success
@@ -207,7 +210,23 @@
 -- - inventory_get_list(name) -> {item1, item2, ...}
 -- - get_look_dir(): get camera direction as a unit vector
 -- - get_look_pitch(): pitch in radians
+--
 -- - get_look_yaw(): yaw in radians (wraps around pretty randomly as of now)
+-- InvRef
+-- - get_size(listname): get size of a list
+-- - set_size(listname, size): set size of a list
+-- - get_stack(listname, i): get a copy of stack index i in list
+-- - set_stack(listname, i, stack): copy stack to index i in list
+-- - get_list(listname): return full list
+-- - set_list(listname, list): set full list (size will not change)
+-- - autoinsert_stack(listname, stack): insert stack somewhere in list
+-- - autoinsert_stackstring(listname, stackstring)
+--
+-- ItemStack
+-- - peek_item(): return item from stack without removing it
+-- - take_item(): remove item from stack and return it
+-- - put_item(): put item in stack; return false if not possible
+-- - put_stackstring(): put stackstring in stack; return false if not possible
 --
 -- Registered entities:
 -- - Functions receive a "luaentity" as self: