Add hotkeys for world interaction (#59542)

Seetings, mods, and template are arbitrary, it's just the lack of delete
and reset that were annoying me.

src/main_menu.cpp

@@ -1026,9 +1026,11 @@ void main_menu::world_tab( const std::string &worldname )
     uilist mmenu( string_format( _( "Manage world \"%s\"" ), worldname ), {} );
     mmenu.border_color = c_white;
     int opt_val = 0;
+    std::array<char, 5> hotkeys = { 'd', 'r', 'm', 's', 't' };
     for( const std::string &it : vWorldSubItems ) {
-        mmenu.entries.emplace_back( opt_val++, true, MENU_AUTOASSIGN,
+        mmenu.entries.emplace_back( opt_val, true, hotkeys[opt_val],
                                     remove_color_tags( shortcut_text( c_white, it ) ) );
+        ++opt_val;
     }
     mmenu.entries.emplace_back( opt_val, true, 'q', _( "<- Back to Main Menu" ), c_yellow, c_yellow );
     mmenu.query();