Pet container rewritten

Libs/DF/definitions.lua

@@ -5,6 +5,7 @@
 ---@field reverse fun(tbl:table) : table reverse the order of an array
 ---@field append fun(tbl1:table, tbl2:table) : table append the array of table2 to table1
 ---@field duplicate fun(tblReceiving:table, tblGiving:table) : table copy the values from table2 to table1 overwriting existing values, ignores __index and __newindex, keys pointing to a UIObject are preserved
+---@field countkeys fun(tbl:table) : number count the keys of a table
 ---@field copy fun(tblReceiving:table, tblGiving:table) : table copy the values from table2 to table1 overwriting existing values, ignores __index and __newindex, threat UIObjects as regular tables
 ---@field deploy fun(tblReceiving:table, tblGiving:table) : table copy keys/values that does exist on tblGiving but not in tblReceiving
 ---@field copytocompress fun(tblReceiving:table, tblGiving:table) : table copy the values from table2 to table1 overwriting existing values, ignores __index, functions and tables with a 'GetObjectType' key