Remove `pickup_mode` option, introduce `pickup_menu`

End result is that:
* `pickup_menu = true` is old `pickup_mode = multi`, and new default
* `pickup_menu = false` is old `pickup_mode = single`
* `pickup_mode = auto:X` is gone without replacement for being of little use

Recognizing the old option in initfile did not make much sense either
because the default changed: Old `multi` was the only setting that
anybody would include in their rcfile, and that one is now meaningless.

So if your config until now included a line like the following:
    pickup_mode = multi
you can now safely remove this.
If you prefer the old default behavior, use this option from now on:
    pickup_menu = false

1 files changed, 1 insertions, 2 deletions

diff --git a/crawl-ref/source/options.h b/crawl-ref/source/options.h
index 371ba0ed14..6a5c18b569 100644
--- a/crawl-ref/source/options.h
+++ b/crawl-ref/source/options.h
@@ -337,8 +337,7 @@ public:
 
     int         drop_mode;          // Controls whether single or multidrop
                                     // is the default.
-    int         pickup_mode;        // -1 for single, 0 for menu,
-                                    // X for 'if at least X items present'
+    bool        pickup_menu;        // false for single, true for menu
 
     bool        easy_exit_menu;     // Menus are easier to get out of