Changes

* {{cmd|startitemize}} can be nested * {{cmd|item}} to create subitemsprint ordinary items* {{cmd|sym}} can be used to specify items print an item with a custom symbol* {{cmd|mar}} to print an item with margin text* {{cmd|sub}} to print an item with a continuation mark* {{cmd|its}} to print an item with a row of marks(for response ranges)* {{cmd|ran}} to print a range for the {{cmd|its}} row* {{cmd|head}} to print a head within the list* {{cmd|but}} to print an item whose mark is an interactive button